Authorities say the bodies of eight people, including five children, were found inside a Houston-area home Saturday night after an hour-long standoff with a man who shot at police, the Associated Press reports.

According to the Harris County Sheriff’s Office, deputies were called to the house to perform a welfare check at around 9 p.m. when they spotted a dead child through a window and decided to enter the residence. From NBC News:

“A sergeant and three deputies made entry into the house and at that point the 49-year-old subject began to shoot a weapon in the house. Our deputies pulled back and formed a perimeter,” [Deputy Thomas] Gilliland said.

The negotiator was called in and the suspect was arrested without incident about an hour later, Gilliland said.

Officers were then able to enter the house, at which point they discovered the eight bodies.

CNN reports that it is not currently known how the victims were killed or what their relationship to the suspect might have been.

“Homicide detectives have taken over the operation along with our crime scene unit,” said Deputy Thomas Gilliland. “Due to the amount of victims and the proximity to the people in the house, it’ll be a scene that’s going on for a while.”

[Image via KHOU]