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DALLAS, TX - JULY 08:  Dallas Police Chief David Brown is greeted with a hug at a prayer vigil following the deaths of five police officers last night during a Black Live Matter march on July 8, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured  in a coordinated ambush at a anti-police brutality demonstration in Dallas. Investigators are saying the suspect is 25-year-old Micah Xavier Johnson of Mesquite, Texas. This is the deadliest incident for U.S. law enforcement since September 11.  (Photo by Spencer Platt/Getty Images)
DALLAS, TX - JULY 08:  Dallas Police Chief David Brown is greeted with a hug at a prayer vigil following the deaths of five police officers last night during a Black Live Matter march on July 8, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured  in a coordinated ambush at a anti-police brutality demonstration in Dallas. Investigators are saying the suspect is 25-year-old Micah Xavier Johnson of Mesquite, Texas. This is the deadliest incident for U.S. law enforcement since September 11.  (Photo by Spencer Platt/Getty Images)

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    People line up to hug police officers in Dallas

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People line up to hug police officers in Dallas

After an interfaith prayer service, crowds lined up to hug police officers in downtown Dallas. Five officers were killed in a sniper attack on Thursday.

People line up to hug police officers in Dallas

After an interfaith prayer service, crowds lined up to hug police officers in downtown Dallas. Five officers were killed in a sniper attack on Thursday.