Family and friends of the victims who died in a shooting, comfort each down the street from the scene in Colorado Springs, Colo., on Sunday, May 9, 2021. The suspected shooter was the boyfriend of a female victim at the party attended by friends, family and children. He walked inside and opened fire before shooting himself, police said. Children at the attack weren't hurt and were placed with relatives.

COLORADO SPRINGS, Colo. — A gunman opened fire at a birthday party in Colorado, slaying six adults before killing himself Sunday, police said.

The shooting happened just after midnight in a mobile home park on the east side of Colorado Springs, police said.

Officers arrived at a trailer to find six dead adults and a man with serious injuries who died later at a hospital, the Colorado Springs Gazette reported.

The suspected shooter was the boyfriend of a female victim at the party attended by friends, family and children. He walked inside and opened fire before shooting himself, police said.

The birthday party was for one of the people killed, police said.

Neighbor Yenifer Reyes told The Denver Post she woke to the sound of many gunshots.

“I thought it was a thunderstorm,” Reyes said. “Then I started hearing sirens.”

Police brought children out of the trailer and put them into at least one patrol car, she said, adding that the children were “crying hysterically.”

Authorities say the children, who weren't hurt in the attack, have been placed with relatives.

Police on Sunday hadn't released the identities of the shooter or victims. Authorities say a motive wasn't immediately known.