Read more about this story from CNN affiliate KHOU.
(CNN) -- Three children died and at least four others were hospitalized after being trapped inside a fire-ravaged Houston building, a fire official said.
Houston firefighters received a call around 1:30 p.m. about a house fire in West Houston, fire department spokesman Patrick Trahan said. According to the city of Houston's website, 12 fire department units responded to the blaze.
They arrived to find numerous children trapped inside the building, with Trahan telling HLN's Mike Brooks that the firefighters fought through intense heat to pull out some victims.
Firefighters performed CPR on at least four children at the scene, according to Trahan. The spokesman told Brooks that there were three dead, though details on the victims' age, gender or exact cause of death were not immediately available.
At least seven children total -- including those who died -- were taken to area hospitals, Trahan said.
Video footage from outside the home, which was in a residential area, showed a vehicle that had the words "Jackie's Child Care 24/6" emblazoned on its side.
There was no record of any such operation on the Texas Department of Family and Child Services website. But another site -- childhomedaycare.com, which bills itself as an "independent organization dedicated to providing a comprehensive list of nationwide child care providers" -- lists a child care program run at that West Houston address where the fire occurred.
"I'm a mom. It's very shocking. It's very upsetting," Jennifer Williams, who lives nearby, told CNN affiliate KHOU. "It's hard to hear."
CNN's Vivian Kuo contributed to this report.