The death of a man whose body was found early Friday at the scene of a northeast Minneapolis fire is being investigated as a homicide, police said Saturday.

Jacob Wayne Arvidson, 52, of Minneapolis, died of “complex homicidal violence,” according to the Hennepin County medical examiner. His body was found as crews were putting out a small fire in a building in the 1800 block of NE. Central Avenue around 2:35 a.m.

Detectives and the Police Department’s Crime Lab collected evidence and canvassed the area in the hours after the 911 call came in. Investigators spoke to people in the area to learn more about what happened.

Police and homicide investigators deemed the death suspicious and are investigating it as a homicide, according to police spokesman John Elder.

No arrests had been made as of Saturday morning, but investigators have made “substantial headway” in the case, Elder said.