A 17-year-old girl reported an unknown suspect tried to remove her clothes at about 9 p.m. Friday in downtown State College -- at least the fourth sexual assault since late August.

The victim was looking for her boyfriend after a State College Area High School football game when a man tried to remove her shirt and pants in the south parking lot of the Fraser Street post office near the Central Parklet.

She was able to flee the scene and reported the incident to a police officer covering the high school football game at Memorial Field.

The State College Police Department is investigating the incident. Police describe the suspect as a black man, about 19 years old and 6 feet 2 inches tall with a stocky build. He was wearing a gray sweatshirt with a dark logo on the front, dark jeans, white sneakers, a light blue scarf and a large, silver watch on his left wrist.

Friday's sexual assault follows a rash of stranger assaults and assault attempts since this summer.

On June 25, two suspects, one armed with a knife, forced their way into a victim's car at the corner of Beaver Avenue and Allen Street. They made her drive to an area near Fraternity Row where one raped her as the other served as a lookout.

In that case, one suspect was described as white, 5 feet 6 inches tall with brown hair and sideburns. The other was described as black with a medium build, slightly taller than the other suspect.

During late August through September, four women were able to escape male assailants who accosted them on campus and in downtown State College.

On Aug. 30, a victim fought off an attacker after he tried to remove her clothes. She was sexually assaulted on the corner of Pugh Street and East Nittany Avenue after being followed through Central Parklet in State College. The suspect is described as a white man, 5 feet 10 inches tall.

On Sept. 10, a woman was sexually assaulted between Fenske and Althouse buildings on campus. The victim was approached from behind, and the suspect lowered her shorts and undergarments before she was able to get away. The suspect was described as a white man, 5 feet 7 inches tall with short brown hair and a goatee with no mustache.

On Sept.19, an unidentified man tried to remove the clothing of a woman on the 600 block of Clay Lane. The woman fought off the assailant, described as 6 feet tall with a medium build and wearing a dark shirt and a baseball cap.

On Sept. 26, an unknown assailant grabbed a woman and attempted to push her under a tree on the HUB lawn. The victim was able to escape her attacker. The suspect was described as a white man about 6 feet tall with medium build and was wearing black clothing with a hood obscuring his face.

Anyone with information concerning the downtown incidents should contact State College police at 234-7150. Witnesses to the on-campus assaults are urged to contact Penn State Police Services at 863-1111.