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SAN BRUNO, CA - APRIL 03:  Police officers stand by in front of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded.  (Photo by Justin Sullivan/Getty Images)
SAN BRUNO, CA - APRIL 03:  Police officers stand by in front of the YouTube headquarters on April 3, 2018 in San Bruno, California. Police are investigating an active shooter incident at YouTube headquarters that has left at least one person dead and several wounded.  (Photo by Justin Sullivan/Getty Images)

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    Evening news briefing from CNN

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Evening news briefing from CNN

Evening news briefing from CNN on Tuesday, April 3.

Evening news briefing from CNN

Evening news briefing from CNN on Tuesday, April 3.