DETROIT – Police are searching for a man wanted in connection to three, possibly four, recent sexual assaults on Detroit's east side.

Detroit Police Chief James Craig said the most recent sexual assault happened Thursday morning in the 5300 block of Radnor Street. He's calling this a possible "serial situation."

"We discovered a lone female that sustained some injury. It was a sexual assault ... as we began our investigation we determined this was one of possibly four incidents, so it appears we have a serial situation," said Craig.

The chief said these incidents appear related due to the manner in which the crimes were executed. All were home invasions in which a man attacked the victim with either a blunt instrument or a knife.

"In one incident we know he was armed with what appeared to be a kitchen knife. In the most recent incident (the victim suffered) blunt force trauma. We don't know what weapon may have been used," said the chief.

Craig said there was at least one other sexual assault reported in the 5000 block of Radnor Street. Another similar incident was reported in nearby Grosse Pointe Park.

"We're not absolutely certain that (the Grosse Pointe Park) event is connected, but they seem to all be isolated in the 5th Precinct," he said.

All of the assaults happened in the early morning hours, the chief said. Three of the attacks happened within a 1-mile radius in Detroit. Craig said the incident in Grosse Pointe Park is considered related based on the time of day and the description of the attacker.

Suspect description:

Detroit police released the attached composite sketch of a possible suspect. Here is a description of the man:

Black male between 17 and 23 years old standing about 5 feet 8 inches tall and weighing about 135 or 140 pounds. He has a small build, a dark complexion, dark eyes, a light fuzzy mustache and dark brown "smoker" lips. He was wearing a light blue jean jacket over a red hoodie, blue jeans, and black and white gym shoes.

Police advise people in the are of the 5000 block of Radnor Street to lock their doors and windows. This man may be canvassing the area looking for easy access to homes. All of the attacks happened inside homes.

Sketch resembles one from Grosse Pointe Park police

The sketch resembles the one Grosse Pointe Park police released in connection to a Dec. 13 attack on Cadieux Road near Charlevoix Street. Police said the woman told them she was confronted by a man, whom she believed had been following her, and was cut several times.

Her attacker was described as a black man in his early 20s and 6 feet tall with a very thin build. He was wearing a white sweatshirt with the hood pulled up and blue shorts.

Anyone with information on any of these crimes needs to contact police or Crime Stoppers at 800-SPEAK-UP.