At least two people have been shot at Taft Union high school in southern Californian, according to local media reports.
The suspected shooter has been taken into custody, according to local radio station KERO. Early reports indicate that one victim was airlifted to hospital.
Students were evacuated to the football field, whilst Kern County Sheriff's officials went room-to-room to secure the campus, according to reports.
More top news
A four-year-old boy is among 20 people to have died in some of the worst flooding West Virginia has seen.
The heavy showers will ease off this weekend.
Labour MPs are attempting to build a consensus for a single challenger to Corbyn, while the big game in the Tory Party is Stop Boris.