Police have released a description of a suspect in a Friday incident classified as harassment and attempted assault, following three sexual assaults by unknown assailants this month.

This incident could be the most recent in a string of sexual assaults Penn State Police Services and the State College Police Department are jointly investigating, Penn State Police Supervisor Tyrone Parham said.

There is not enough evidence, specifically regarding descriptions of assailants, to link any of the sexual assaults or this most recent incident.

Friday's suspect was wearing a black, hooded sweatshirt, black jeans and black sneakers, when he grabbed a female Penn State student's arms at about 10 p.m. just south of the HUB lawn.

The suspect is described as a white male, about 6 feet tall, with a medium build, Parham said.

The assault occurred on a pathway between Henderson Building and Atherton Hall. The suspect was not hiding, but walked toward her before trying to push her against a tree. The female student struggled and got away from the assailant fairly quickly, Penn State Police Services Supervisor Bill Moerschbacher said.

A police report of the crime indicates the victim described the incident as an attempted assault.

But Parham said it is uncertain whether Friday's HUB lawn assault was sexual in nature.

"We have it titled as an assault, but not a sexual assault," he said.

Friday's incident differs from the three stranger sexual assaults this month because the assailant did not grab the victim's clothing, Parham added.

The suspect in an Aug. 29 assault was described as a white male over 5 feet 8 inches tall, and the suspect in a Sept. 19 assault is described as a 6-foot tall male with a medium build.

The description of a suspect in a Sept. 10 assault, the first to occur on campus this month, provided Penn State police with enough detail to form a composite sketch. The suspect in that assault is described as a white male around 5 feet 7 inches tall with a stocky build, a goatee without a mustache and short, dark hair.

The string of stranger sexual assaults, two occurring in downtown State College and one occurring on campus, is uncommon for the area.

"I would say this is unusual -- certainly a rarity," Moerschbacher said.

While police have received tips on the cases, they have not received enough information to make any arrests, Parham said.