A gunman armed with tactical gear opened fire Monday morning at Border Patrol agents in what law enforcement says was a deliberate ambush outside a federal annex facility in McAllen, Texas, prompting agents and local police to return fire and kill the shooter. "This morning an individual opened [fire] at the entrance of the United States Border Patrol sector annex in McAllen, Texas," the Department of Homeland Security said in a statement to Fox News. "Both Border Patrol agents and local police