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DALLAS, TX - July 8, 2016: Dallas Mayor Mike Rawlings (R) looks on during a press conference at Dallas City Hall as Dallas Police Chief David Brown speaks on the fatal shootings of five police officers on July 8, 2016 in Dallas, Texas. At least one sniper killed five officers and wounded seven others in a coordinated ambush at a anti-police brutality demonstration in Dallas. The sniper was killed, and three other people are in custody, officials said.  (Photo by Stewart  F. House/Getty Images)
DALLAS, TX - July 8, 2016: Dallas Mayor Mike Rawlings (R) looks on during a press conference at Dallas City Hall as Dallas Police Chief David Brown speaks on the fatal shootings of five police officers on July 8, 2016 in Dallas, Texas. At least one sniper killed five officers and wounded seven others in a coordinated ambush at a anti-police brutality demonstration in Dallas. The sniper was killed, and three other people are in custody, officials said.  (Photo by Stewart  F. House/Getty Images)

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Dallas Police have not ruled out others being complicit

In an exclusive interview, Dallas Police Chief David Brown tells Jake Tapper that investigators haven't ruled out others being complicit in the attack

Dallas Police have not ruled out others being complicit

In an exclusive interview, Dallas Police Chief David Brown tells Jake Tapper that investigators haven't ruled out others being complicit in the attack