Dayton police are investigating an attack on a woman who reportedly ran naked to a neighbor’s apartment early Friday and later said she had been raped.

A woman called 911 when she was awakened at about 5 a.m. by the fire alarm sounding in her apartment building and someone pounding on her door.

She told police the woman pounding at the door was naked, hysterical and asked for an ambulance. The caller assumed the woman had been raped, according to a police incident report.

Responding officers found the victim covered by a sheet, lying on a sofa in the lobby of her apartment building. She told an officer that she had been beaten, but said no when asked if she had been raped. The left side of her face was visibly swollen, according to the report.

Sgt. Larry Tolpin, head of the Special Victim’s Unit, said the female later told a nurse at the hospital that she had been raped. She also told police she did not know the man who attacked her, but Tolpin said it appears the man was an acquaintance.

Police are investigating the incident. No charges have been filed.