Dallas Police officer Patrick Zamarripa is pictured in this undated family handout photo. Zamarripa, an U.S. Navy veteran, is one of the officers killed in an attack in which five police officers were shot dead at a protest decrying police shootings of black men according to media reports and his friends on social media. Hector Zamarripa/Handout via Reuters ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY.
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