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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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    Chaos in Dallas as 12 officers are shot

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Chaos in Dallas as 12 officers are shot

Shooters killed five officers during protests against police in downtown Dallas, marking the deadliest incident for U.S. law enforcement since September 11, 2001.

Chaos in Dallas as 12 officers are shot

Shooters killed five officers during protests against police in downtown Dallas, marking the deadliest incident for U.S. law enforcement since September 11, 2001.