SACRAMENTO, Calif. (AP) — A man shot and killed his three children, one other person and himself at a church in Sacramento on Monday, authorities said.

Deputies responding to reports of gunfire around 5 p.m. found five people dead, including the shooter, at the church in the Arden-Arcade neighborhood, said Sgt. Rod Grassmann with the Sacramento County Sheriff’s Office.

The victims included three juveniles younger than 15, Grassman said. He didn’t know their genders.

The identity of the other victim wasn’t immediately known.

A church employee heard the gunshots and called 911, Grassman said. The shooting occurred in the main sanctuary area, he said.

Sheriff’s officials are investigating it as a domestic violence incident, Grassman said.

Officials didn’t know if the family members belonged to the church, which sits on a mostly residential block near a commercial area east of downtown Sacramento.

The Church In Sacramento caters to English, Chinese and Spanish worshippers, according to its website. No events for Monday were listed on its online calendar.

Gov. Gavin Newsom said his office was working with local law enforcement.

“Another senseless act of gun violence in America — this time in our backyard. In a church with kids inside. Absolutely devastating,” Newsom said on Twitter.