Montgomery County police are investigating three sexual assaults of elderly women in Germantown, including a 68-year-old woman who was attacked in her apartment twice in the past seven months.

The most recent incident happened at about 1 a.m. Wednesday, when a man entered the woman's apartment on Beaconfield Terrace and sexually assaulted her while she was in bed. The woman was the victim of a similar attack on June 19, and told police she believed the same person assaulted her both times.

The other attack occurred on Aug. 21, when an 86-year-old woman was raped at the Churchill Senior Living Center, located at 21000 Father Hurley Blvd., across the street from the Beaconfield Terrace apartment. A man entered the woman's room in the assisted-living complex through an unlocked window, police said.

Police say they believe the June and August assaults were committed by the same person. It's likely that the same suspect is also responsible for Wednesday's attack, police said, but that hasn't been confirmed.

The suspect is described as a black man who in his late teens or early 20s, about 5 feet 8 inches to 5 feet 10 inches tall and about 145 pounds. He has a thin build and no facial hair.