2-Year-Old Boy's Hot Car Death Under Investigation by Dallas Police

— -- Dallas police said today they were still investigating the death of a 2-year-old boy who had been left in a hot car as his family attended church this weekend.

According to police, officers responded to a call from Dallas Fire-Rescue on Sunday around 4:20 p.m. regarding the toddler, who had been found inside of a vehicle at 11000 Shiloh Rd.

"The child was transported to a local hospital where the child was pronounced deceased," police spokesman Carlos Almeida said.

Almeida said it was "an active investigation" and no further details were available.

According to KidsAndCars.org, Boi Lei Sang, 2, is the fifth child to die in a hot car in Texas this year. Across the U.S., 21 children have died of heatstroke in a vehicle so far this year, compared to 11 children by this time in 2015.

It is not known how long the boy had been in the car.

Reng Om was attending services at Dallas Matu Christian Church with other families when, he said, the father entered the church carrying the unresponsive little boy.

Om told ABC News affiliate WFAA-TV that the family attended the church.

He said that his understanding was that when the father of five didn't see the child with his four siblings in a classroom, he went looking for him. The boy was found around 3 p.m. in the family's 2006 Honda Pilot, Om told WFAA-TV.

"The parent was very, you know, just very upset," Om said. "I'm really upset for him, the family."

According to the local weather report on WFAA-TV, temperatures in the area reached 100 degrees Sunday.