Boulder police are investigating the report of a sexual assault between midnight and 1 a.m. on Wednesday, May 11, in the area of University Hill. A female University of Colorado student told friends that she was approached by one to three males in a white sedan and sexually assaulted while walking from a party in the 900 block of University Avenue. One of the friends reported the incident to police. Investigators have spoken with the victim, but she has been unable to provide detailed information about what occurred.