Police are investigating after a nude and bleeding woman walked into the Petaluma High School gym. It happened Tuesday afternoon, following a class held inside the gym. Witnesses report the woman had cut herself, with some saying she also collapsed on the gym floor. School staff evacuated the gym and called 911 after the woman refused to leave. Police say the woman was in the middle of a mental health crisis and is now hospitalized. Her injuries, which first responders say were self-inflicted, are not considered life-threatening. Many parents are saying that video of the incident was made by a student in the gym, and it has been circulated widely by other teens.