Two adults are dead in a San Bernardino North Park Elementary School classroom in what is believed to be murder-suicide, San Bernardino Police Chief Jarrod Burguan tweeted.
Authorities believe the suspect is down and there is no further threat, Burguan said.
California authorities responded to a report of a shooting at the school.
Two students were transported to a hospital.
The other students in the school were being evacuated and taken to a nearby school.