MISSOULA, Mont. (AP) — The University of Montana sent out an email alert after a female student reported being attacked outside a sorority house.

Missoula police say the 18-year-old woman said she was grabbed and knocked to the ground as she walked from the university to the Kappa Kappa Gamma sorority house at about 7 p.m. Tuesday.

The woman said her attacker released her after he heard people walking toward them.

The woman said her attacker was a white man in his early 20s, about 5 feet, 6 inches tall and skinny with shoulder-length blond hair, no facial hair and wire-rimmed glasses that may have been broken during the struggle.

The woman suffered minor injuries but declined medical attention.

Police sent out extra foot patrols in the area, but were not able to locate the man.