Gunshots have been reported at the Santa Monica Community College campus in west Los Angeles.
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The Hollywood star refused to appear on ITV's Good Morning Britain because of host Piers Morgan's comments about the women's marches.
The former Ukip leader has torn into the Labour leader as he backed his successor Paul Nuttall to claim the vacant Stoke Central seat.
The man, in his thirties, was found with stab injuries on the upper deck of a bus in Handsworth, Birmingham, on Monday night.