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TOPSHOT - Bystanders stand near pollice baracades following the sniper shooting in Dallas on July 7, 2016. 
A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted.
 / AFP / Laura Buckman        (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
TOPSHOT - Bystanders stand near pollice baracades following the sniper shooting in Dallas on July 7, 2016. 
A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted.
 / AFP / Laura Buckman        (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)

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