DES MOINES — University of Iowa police are investigating a report by a woman who says she was grabbed from behind and sexually assaulted while walking on the campus grounds.

Des Moines television station KCCI-TV reports that the woman told police the attack happened Thursday night near the university’s Biological Sciences Library.

The woman said she was walking alone when she was pulled from behind into the alley and sexually assaulted. She sustained minor physical injuries in the attack.

Police are searching for a suspect in the attack and are asking people on campus to walk in groups, if possible.