UPDATED: 06/12/16, 4:54PM

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ORLANDO, Fla. (CBSDFW/AP) – The Latest on the shooting at an Orlando nightclub:

4:20 p.m. – American Muslim leaders are condemning the attack on a gay nightclub in Orlando that killed 50 people and wounded more than 50 others.

Nihad Awad, the executive director of the Council on American-Islamic Relations, called the killings a hate crime and said the group has no tolerance for extremism of any kind.

A law enforcement official has said the gunman, Omar Mateen, called 911 from the nightclub and expressed allegiance to an Islamic State leader.

Awad says members of the LGBT community have stood with Muslims in the past and today they stand that community.

3:20 p.m. – A former Afghan official says the father of the Orlando nightclub gunman is a native of Afghanistan who appears on a television program known for “its anti-US tirades” and “pro-Taliban” remarks.

The official says the gunman’s father is Seddique Mateen and that the program is broadcast in the Dari language. The official spoke only on condition of anonymity because he did not want to be linked to coverage of the shooting.

Mateen is the father of Omar Mateen, who authorities say killed 50 people at the nightclub.

The official said Seddique Mateen’s “Durand Jirga Show” is anti-Pakistan. The name of the show references the Durand line, the long disputed border between Afghanistan and Pakistan.

Seddique Mateen campaigned in the United States for current Afghan President Ashraf Ghani, who appeared on his program in 2014. The program’s studio has an address in Fort Pierce, Florida.

2:45 p.m. – The city of Orlando is publishing the names of those killed in a massacre at a gay nightclub on its website after their families have been contacted.

As of 3:45 p.m. Sunday, the list had four names. Fifty people were killed.

Shooter Omar Mateen was killed; his name is not on the list.

Fifty-three more were hospitalized.

The city’s website includes the #PrayforOrlando hashtag and says officials are “working tirelessly” to get information to families.

The list can be found at http://www.cityoforlando.net/blog/victims/

2:25 p.m. – The ex-wife of the man authorities say killed 50 people at an Orlando nightclub says he beat her repeatedly while they were married.

The ex-wife told The Washington Post that she met Omar Mateen online about eight years ago and decided to move to Florida and marry him. The ex-wife, who wasn’t named in the report, says at first the marriage was normal, but then he became abusive.

They were together for only a few months and her parents intervened when they learned Mateen had assaulted her. She says he wasn’t very religious and gave no signs of radical Islam. She said he owned a small-caliber handgun and worked as a guard at a nearby facility for juvenile delinquents.

Mateen’s ex-wife said his family was from Afghanistan, but her ex-husband was born in New York. His family later moved to Florida.

2:20 p.m. – Officials are giving more details about the shooter in a massacre at a gay Orlando nightclub.

Ronald Hopper of the FBI says shooter Omar Mateen was 29 and an American citizen. He was not under surveillance at the time of the shooting.

Hopper says Mateen purchased at least two firearms within the last week or so.

Hopper says some 911 calls involving the shooter and the massacre have become federal evidence. He says the conversations involved the Islamic State.

Hopper says the shooter in 2013 made inflammatory comments to co-workers , and that Mateen was interviewed twice. Hopper calls those interviews inconclusive.

In 2014, Hopper says, officials found that Mateen had ties to an American suicide bomber. Hopper describes the contact as minimal; it did not constitute a threat at that time.

2:15 p.m. – Police say 11 officers exchanged gunfire with the shooter at a gay Florida nightclub.

Orlando police Chief John Mina gave the details at a Sunday afternoon news conference.

Also, officials say three deputy sheriffs actively engaged, and fired their weapons. They’re relieved of duties pending an investigation. That’s typical procedure in such cases.

2:15 p.m. – The suspected Orlando night club shooter Omar Mateen was a security guard with G4S. In a 2012 newsletter, the firm identified him as working in West Palm Beach.

In a statement sent to the Palm Beach Post, the security company confirmed his employment.

“We are shocked and saddened by the tragic event that occurred at the Orlando nightclub. We can confirm that Omar Mateen had been employed with G4S since September 10, 2007. We are cooperating fully with all law enforcement authorities, including the FBI, as they conduct their investigation. Our thoughts and prayers are with all of the friends, families and people affected by this unspeakable tragedy.”

1:05 p.m. – President Barack Obama addressed the Orlando shooting on Sunday afternoon saying the attack was, “an act of terror, and an act of hate.”  The President also reminded the public that the massacre was “yet another reminder of how easy it is to obtain weapons in America.”

The President told the media the FBI is currently investigating the shooting as an act of terrorism.

10112:45 p.m. – A law enforcement official says the shooter in the massacre at a gay Florida nightclub was known to the FBI before the incident and had been looked at by agents within the last few years.

The official spoke to The Associated Press Sunday about the shooting, the deadliest in U.S. history. The official was not authorized to discuss the ongoing investigation and on spoke on condition of anonymity.

The shooter has been identified as Omar Mateen of Florida. The official says the matter for which Mateen came under investigation was “open and closed pretty quickly.”

Other details about the matter weren’t immediately available.

12:40 p.m.– CBS News reporting that Orlando shooting suspect Omar Mir Seddique Mateen, called 911 and pledged allegiance to ISIS before the shooting.

11:45 a.m. – The ranking Democrat on the House Intelligence Committee says law enforcement officials and the intelligence community are checking to see what information they had on the shooter prior to the massacre at a gay Florida nightclub.

Rep. Adam Schiff called the attack “painfully reminiscent” of the November shootings at the Bataclan Theatre in Paris.

He says in a statement, “This morning, I will be marching in the West Hollywood Pride Parade with a heavy heart, but we will march in solidarity with all those who are the victims of terrorism and hatred.”

11:30 a.m. – “This is clearly an act of terror,” Florida Governor Rick Scott says of Orlando mass shooting.

Gov. Scott is calling the shooting at a gay Orlando nightclub “heartwrenching” and says people who went into the building knowing there was an active shooter are heroic.

He spoke Sunday afternoon at a news conference, hours after 50 people were killed. Officials have said 53 more are hospitalized.
Scott urged people to donate blood. He says officials are doing everything they can.

He says the massacre was “clearly an act of terror.” He adds, “To take that number of lives is clearly an act of terror.”

Officials have said they’re investigating whether the incident was an act of terrorism.

112311:20 a.m. – The White House says President Barack open will give a statement Sunday afternoon about the nightclub shooting in Florida.

Obama has been briefed by his homeland security and counterterrorism adviser and has asked for regular updates as the FBI and other federal officials work with police in Orlando, Florida, on the case.

11:00 a.m. –  A SWAT truck and a bomb disposal unit are on the scene of an address associated with the man named as the shooter in a massacre at a gay nightclub in Orlando.

There is a media staging area set up about a block away from the apartment complex in a residential neighborhood in Fort Pierce, Florida, on Sunday. The shooter has been identified Omar Mateen.

Fort Pierce is about 118 miles southeast of Orlando. The apartment complex is a series of two-story buildings.

Numerous police officers and members of the FBI also area there.

10:45 a.m. – The father of the man named as the shooter in a massacre at a gay Florida nightclub says he’s in shock and that he wasn’t aware of anything his son might have been planning.

Mir Seddique is the father of Omar Mateen of Port St. Lucie, Florida. Seddique told NBC News that his son got angry when he saw two men kissing in Miami a couple of months ago and thinks that may be related to the shooting.

Seddique says: “We are saying we are apologizing for the whole incident. … We are in shock like the whole country.”

The father also says the incident has nothing to do with religion.

Officials say the shooter was among the 50 killed, and that they’re investigating whether the incident was an act of terrorism.

WATCH ONLINE: Live Coverage from Orlando, Florida

10:20 a.m. – Families and friends are awaiting word outside an Orlando hospital to learn whether their loved ones are among 50 killed and 53 more hospitalized at a shooting at a gay nightclub.

About 50 people were gathered outside Orlando Regional Medical Center on Sunday, many in tears and anxious.

Fatriana Evans frequents the Pulse nightclub and was outside when shots were fired.

Evans says, “It sounded like fireworks – pop, pop, pop – and then everybody scatters.”

Jackie Smith was inside the club and says two friends next to her were shot. She says she hasn’t gotten updates on their conditions. She came out of the hospital and burst into tears in the arms of friends.

She says: “Some guy walked in and started shooting everybody. He had an automatic rifle, so nobody stood a chance. I just tried to get out of there.”

10:00 a.m. – Police say the shooter at an Orlando nightclub used an AR-15-type assault rifle on all the victims.

Police Chief John Mina said at a Sunday news conference that the shooter used the assault rifle, with unknown rounds, and also had a handgun.

Officials at the news conference also say they have securing the suspect’s vehicle, a van, right outside the club.

The shooter has been identified as Omar Mateen of Port St. Lucie, Florida. Officials have said they’re investigating whether the massacre was an act of terrorism.

Dr. Mike Cheatham is a trauma surgeon at Orlando Regional Medical Center, where 46 patients were taken. The majority are in critical condition.

He tells The Associated Press, “I think we will see the death toll rise.”

Orlando shooting suspect Omar Mir Seddique Mateen

Orlando shooting suspect Omar Mir Seddique Mateen

9:51 a.m. – The massacre at an Orlando nightclub that claimed 50 lives is the worst mass shooting in U.S. history.

Police Chief John Mina confirmed at a news conference Sunday morning that 50 people were killed, up from 20 as earlier reported.

Mayor Buddy Dyer says 53 more are hospitalized after the early Sunday incident. He says the shooter is among the dead. He also says the shooter used an assault rifle on all those dead. Officials say one officer was shot, and has injuries to his face.

Earlier, U.S. Rep. Alan Grayson identified the shooter as Omar Mateen of Port St. Lucie, Florida. He cited law enforcement officials in speaking to reporters.

Officials also have said they’re investigating whether the incident was an act of terrorism.

9079:30 a.m. – The mayor of Orlando says there were 50 casualties and there are 53 more hospitalized after a mass shooting at a popular gay nightclub there.

“There’s blood everywhere,” Mayor Buddy Dyer said Sunday at a news conference, hours after the shooting.
He says the shooter used an assault rifle on all those killed.

Earlier, U.S. Rep. Alan Grayson identified the shooter as Omar Mateen of Port St. Lucie, Florida. He cited law enforcement officials in speaking to reporters.

9449:20 a.m. – Florida’s governor is headed to Orlando after a shooting at a gay nightclub.

Officials on the scene now say the death toll has risen to 50, with another 53 wounded.

Gov. Rick Scott says in a statement Sunday, hours after the incident, that thoughts and prayers are with the victims and their families.

The statement says he’ll meet with law enforcement and local officials in Orlando.

Scott says: “We will devote every resource available to assist with the shooting in Orlando. Our state emergency operations center is also monitoring this tragic incident.”

His statement also thanks the first responders.

Florida Department of Law Enforcement Special Agent in Charge Danny Banks said earlier that the mass shooting is being investigated as an act of terrorism. He says authorities are looking into whether the incident was an act of domestic or international terror, and if the shooter was a lone wolf.

8:45 a.m. – Orlando shooting suspect believed to be U.S. citizen 29-year old Omar Mateen, of St. Lucie county, FL. He had no apparent criminal history, sources say.

President Barack Obama has been briefed by his homeland security and counterterrorism adviser about the shooting at a gay nightclub in Orlando that left about 20 people dead and 42 wounded.

The White House says Obama has been briefed and has asked for regular updates as the FBI and other federal officials work with Orlando police on the case.

Press secretary Josh Earnest said in a statement that the president has directed federal officials to provide “any necessary assistance to pursue the investigation and support the community.”

Orlando police officers seen outside of Pulse nightclub after a fatal shooting and hostage situation on June 12, 2016 in Orlando, Florida. The suspect was shot and killed by police after 20 people died and 42 were injured. (Photo by Gerardo Mora/Getty Images)

Orlando police officers seen outside of Pulse nightclub after a fatal shooting and hostage situation on June 12, 2016 in Orlando, Florida. The suspect was shot and killed by police after 20 people died and 42 were injured. (Photo by Gerardo Mora/Getty Images)

7:25 a.m. – Police say approximately 20 people have been killed inside a Florida nightclub, and at least 42 were wounded.

Orlando Police Chief John Mina says authorities have not determined an exact number of people killed, but that “approximately 20” have died.

Florida Department of Law Enforcement Special Agent in Charge Danny Banks says the mass shooting is being investigated as an act of terrorism. He says authorities are looking into whether the early Sunday incident was an act of domestic or international terror, and if the shooter was a lone wolf.

Mina says the shooter was armed with an assault-type rifle, a handgun and some type of suspicious device.

Police had said previously on Twitter that there was a “controlled explosion” at the scene of the shooting at Pulse Orlando, a popular gay dance club. Mina says that noise was caused by a device intended to distract the shooter.

WATCH ONLINE: Live Coverage from Orlando, Florida

7:15 a.m. – Police say multiple people have been killed inside a Florida nightclub, and at least 42 wounded people have been taken to hospitals.

Orlando Police Chief John Mina did not immediately provide an exact number of how many people were killed. Police had said previously that the shooting was a “mass casualty situation.”

Mina says the shooter was armed with an assault-type rifle, a handgun and some type of device. Police had said previously on Twitter that there was a “controlled explosion” at the scene of the shooting at Pulse Orlando.

Mina also says the suspect had exchanged gunshots with an officer working at the club, then went back inside and took hostages around 2 a.m. About three hours later, a SWAT team made the decision to go inside and rescue the hostages. The shooter died in a gunfight with those officers.

5:55 a.m. – Police say the person who opened fire inside a popular Florida nightclub is dead.

Orlando Police did not immediately provide further details on the department’s official Twitter account on Sunday. It was not immediately clear how the shooter died. Police described the shooting as a “mass casualty situation” and said local, state and federal agencies were involved in the investigation.

It was not immediately clear how many people were wounded in the shooting, or if any of the victims had died. Police have told people to stay away from the area and said a noise in the vicinity was a “controlled explosion.” No further details were provided on the explosion.

Dozens of emergency vehicles have swarmed the area around the club.

The club, Pulse Orlando, earlier posted on its own Facebook page just after 2 a.m.: “Everyone get out of pulse and keep running.”

5:15 a.m. – Police say a loud noise near the scene of a reported shooting at a nightclub in Florida was a “controlled explosion.”

Orlando Police said on the department’s official Twitter account Sunday that media should avoid “reporting inaccuracies.” No further details were immediately provided about the explosion.

Police have said “multiple injuries” were reported following the incident at the Pulse Orlando nightclub near Orange and Kaley avenue. The department also advised people to stay away from area.

Multiple emergency vehicles have reportedly responded, including the Orlando Fire Department’s bomb squad and hazardous material team.

Pulse Orlando earlier posted on its own Facebook page just after 2 a.m.: “Everyone get out of pulse and keep running.”

4:50 a.m. – Orlando Police say they are responding to a shooting at a nightclub in Florida.

A post on the department’s official Twitter account early Sunday morning says “multiple injuries” have been reported following the incident at the Pulse Orlando nightclub near Orange and Kaley avenue. The department also advises people to stay away from area.

Multiple emergency vehicles have reportedly responded, including the Orlando Fire Department’s bomb squad and hazardous material team.

Pulse Orlando earlier posted on its own Facebook page: “Everyone get out of pulse and keep running.”

The incident follows the fatal shooting on Friday of 22-year-old singer Christina Grimmie, who was killed after her concert in Orlando by a 27-year-old Florida man who later killed himself. Grimmie was a YouTube sensation and former contestant on “The Voice.”

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