St. Paul police are asking for the public’s help to identify a man who has exposed himself several times.

He went on a porch in the Hamline-Midway area on April 6 about 1 a.m., where he knocked on the door and a resident of the 1200 block of Blair Avenue saw him masturbating and looking through a window, said Sgt. Mike Ernster, a St. Paul police spokesman, on Friday.

Residents in that block of Blair Avenue have continued to report seeing the man through the summer, in people’s yards and looking through windows, Ernster said.

There have also been similar reports of a man exposing himself in Frogtown, and police believe cases in the 800 block of Carroll Avenue also may be connected.

On July 14, a woman reported she saw a man masturbating on her porch about 1 a.m.; it had happened days before, too, she told police.

On Aug. 6 at 11:15 p.m., a woman in the 800 block of Carroll Avenue reported a man was on her porch staring in the window and appeared to be masturbating.

“We have tried extensively to catch this guy, but now we’re asking for the public’s help to identify him or, if anyone sees him in that area, to please call us,” Ernster said. “Our concern is that his behavior could escalate.”

Police ask anyone with information to call the sex-crimes unit at 651-266-5685.