Hubli-Dharwad Police Commissioner B A Padmanayan said the woman in her complaint alleged that a gang of four to five persons barged into her room at night and sexually assaulted her.
The victim, a peon at the Hubli Division of the South-Western Railway, said that after the sexual assault she fell unconscious and found herself in the Railways Hospital, Padmanayan said.
Padmanayan said no arrests of been made so far.
A case had been registered and a search was on for the accused, he said.