GARLAND (CBSDFW.COM) – Officials say two adults and two small children died in a house fire in Garland overnight.

Firefighters responded to the 1400 block of Williams Drive at around 1:15 a.m. Saturday morning. Officials say there was heavy fire coming from the house with people still inside.

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According to officials, firefighters quickly entered the house to rescue the victims, but they were unable to save them.

Officials say there were nine people in the house at the time of the fire. Five were able to make it out, but four were unable to escape.

Anthony Cruz, who lives across the street, says he went outside and saw the homeowner running out of the burning house with his wife and kids. The homeowner also had his cousin’s child, the only person out of five to make it out of the burning room.

“They were trapped inside,” said Cruz, who says he banged on windows, unable to get inside the house due to smoke. “We didn’t know if they were asleep or something. I’m devastated to see two kids dying, a family. Just hearing a little kid saying, ‘Where’s my dad? Where’s my mom?'”

An adult male and female and two small children were pronounced dead. Officials say the four victims were sleeping in a bedroom in the back of the house.

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The Garland Fire Department identified the adult victims as 41-year-old Lorenzo Castillo and 29-year-old Ana Castillo. Ana Castillo’s 5-year-old daughter and Ana and Lorenzo’s 2 year-old son also died in the fire.

The four victims were visiting from Bridgeport, Texas.

According to officials, the fire started in an enclosed back patio. They say the fire doesn’t appear to be intentional. The cause of the fire is still under investigation.

The Garland Fire Marshal says they were using a propane patio heater. The homeowner wasn’t sure if they turned it off before they went to bed. They were also using a fire pit. Fire investigators say either of those heat sources or electronics could have sparked the fire.

Neighbors are trying to raise money for the displaced family, since they lost almost all their belongings in the fire.

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Officials say the house had a single smoke detector in the hallway, but it is currently unknown if it was working.