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People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile.
Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman        (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile.
Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman        (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)

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    Dallas shooting witness: People were trampled

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Dallas shooting witness: People were trampled

Witness Michael Jackson said he saw people getting trampled in the chaos following gunshots in Dallas near the location of a demonstration for Philando Castile and Alton Sterling.

Dallas shooting witness: People were trampled

Witness Michael Jackson said he saw people getting trampled in the chaos following gunshots in Dallas near the location of a demonstration for Philando Castile and Alton Sterling.