Gunfire has erupted at a high school in Kern County, Southern California, according to the local sheriff's office.
The shooting took place at Taft Union High School. There is no immediate word on casualties.
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In a tweet on Saturday, the US president didn't give a reason for his absence but said he wished"everyone well and have a great evening".
Weather conditions remain wet and windy through the weekend.
Mr Banks has given Ukip leader Paul Nuttall an "ultimatum", saying if he is not made chairman he will stop supporting the party.