MILWAUKEE (AP) — Four of the five people found fatally shot this week at a home in Milwaukee were under the age of 20, police said.

Their bodies were found Monday after a 43-year-old man at the house called 911 to report his family was dead. He was arrested at the scene.

The Milwaukee Police Department on Tuesday identified the five victims as Demetrius Thomas, 14; Tera Agee, 16; Lakeitha Stokes, 17; Marcus Stokes, 19, and Teresa Thomas, 41. Police said all five victims were known to the suspect, but they declined to say if all were related.

Milwaukee Mayor Tom Barrett said a child was found alive in the house, but police declined to provide details on the youngster.

The case was expected to be forwarded soon to the Milwaukee County District Attorney’s Office for charges, according to a police statement. The suspect remains in custody.

The man has a history of domestic violence convictions dating back to 2002, the Milwaukee Journal Sentinel reported. He was also under the supervision of the Department of Corrections after being released from prison in 2015, according to online records.