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TOPSHOT - Police officers stand guard at a baracade 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 - Police officers stand guard at a baracade 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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CNN Political Commentator Buck Sexton says movements such as Black Lives Matter have raised the "temperature of rhetoric" against police officers in the U.S.

Panelist: BLM "partially" shares blame for toxic climate

CNN Political Commentator Buck Sexton says movements such as Black Lives Matter have raised the "temperature of rhetoric" against police officers in the U.S.