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(191102) -- SAN FRANCISCO, Nov. 2, 2019 (Xinhua) -- A police officer works at the site of a shooting incident in Orinda, northern California, the United States, Nov. 1, 2019. Four people were killed and several others wounded in the shooting at a Halloween house party Thursday night, local TV network KTVU reported early Friday. (Photo by Li Jianguo/Xinhua)