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
It will be a mainly dry but chilly start across the UK with a few showers across northern Scotland and northwest England.
Marks and Spencer will become the first UK retailer to add vitamin D to its entire packaged bread range.
An over-the-top 80's action movie parody featuring kung fu Hitler and a David Hasselhoff soundtrack gets almost four million views online.