Dozens of police officers are on the scene after a student fired shots inside a high school in Butte County.
A dispatcher says no injuries have been reported after the incident in Oroville's Las Plumas High School.
The dispatcher says police are negotiating with a student gunman.
Parents of the students are gathering outside the school.
A message posted on the Oroville Union High School District's Web site says all six schools in the district are on lockdown.
Calls to the district's phone have been ringing busy.