According to the FBI, the sniper who opened fire on an Immigration and Customs Enforcement field office in Dallas used apps to track ICE agents, and left behind notes saying he acted alone in an attack intended to kill and "terrorize" ICE agents. LiveNOW's Josh Breslow gets the latest on the investigation from FOX Dallas reporter Tisia Muzinga. Raw & unfiltered. Watch non-stop stream of breaking news, live events and stories across the nation.

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