FARGO, N.D. — Fargo police are searching for a man who attacked three North Dakota State University students in an off-campus apartment.

Police Lt. Joel Vettel says the man entered an unlocked door of the ground-floor apartment about 7:45 p.m. Saturday and ordered the women to strip at knifepoint.

Vettel says the man sexually assaulted at least one of the women, and one woman was injured during a struggle. Vettel says the three women ran from the apartment and contacted another tenant, who called 911.