ARLINGTON (CBS 11 News)A tragic double drowning in Arlington Tuesday night has refocused attention on pool safety.

READ MORE: Is DFW The New Mecca For High School Hoops?

Police say it all started when a Grand Prairie man went to check on his mother at her home.

“The father stepped away just for a moment — just for a moment — caring for another family member and the boys were able to gain access to the pool area,” Arlington police spokeswoman Cheryl Carpenter explained.

Police say the father returned to find his two sons, Mark and Luke Nguyen, motionless at the bottom the swimming pool.

The man jumped into the pool and pulled the four-year old twin boys to the surface, but it was too late.

READ MORE: Man And Woman Shot Outside Arlington Barber Shop

Now everyone is trying to answer the question how the boys got in the pool area.

“That is what we’re looking at today and that is whether the gate was properly latched or locked for the boys to easily have access to the pool area,” Carpenter said.

The Arlington Fire Department has a checklist for pool safety that includes ensuring the fence around your pool is at least four feet high. The gate’s latch should also be auto-locking and out of the reach of children.

In the city of Arlington residents can have the fire department do a pool inspection for free.

“Pick up the phone. Give us a call. We’ll schedule a time,” Arlington Fire Department Lt. Kevin Seeton urged. “We’ll come out and talk to the family, check out the pool, check out the area around there, tell the kids some things to watch out for. And while we’re there we’ll let them sit in the fire truck and everything else.”

MORE NEWS: Postal Service Says Its Ready To Deliver This Holiday Season With New, Faster Sorting Machines

Click here to print out a copy of the Arlington Fire Department pool safety checklist.