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People shout slogans during a protest in support of the Black lives matter movement in New York on July 09, 2016. 
The gunman behind a sniper-style attack in Dallas was an Army veteran and loner driven to exact revenge on white officers after the recent deaths of two black men at the hands of police, authorities have said. Micah Johnson, 25, had no criminal history, Dallas police said in a statement. / AFP / KENA BETANCUR        (Photo credit should read KENA BETANCUR/AFP/Getty Images)
People shout slogans during a protest in support of the Black lives matter movement in New York on July 09, 2016. 
The gunman behind a sniper-style attack in Dallas was an Army veteran and loner driven to exact revenge on white officers after the recent deaths of two black men at the hands of police, authorities have said. Micah Johnson, 25, had no criminal history, Dallas police said in a statement. / AFP / KENA BETANCUR        (Photo credit should read KENA BETANCUR/AFP/Getty Images)

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    Weapons, bomb material found in Dallas gunman's home

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Weapons, bomb material found in Dallas gunman's home

Police say they found a series of guns on the Dallas gunman as well as bomb-making material in his family's home. CNN's Ed Lavandera reports.

Weapons, bomb material found in Dallas gunman's home

Police say they found a series of guns on the Dallas gunman as well as bomb-making material in his family's home. CNN's Ed Lavandera reports.