"I believe this is the next chapter, if you will, in our history of violence, specifically active-shooter-type situations," Jesse Hambrick, a retired Georgia deputy sheriff and counter-sniper expert,...

For the second time in two weeks a shooter on a rooftop inflicted death on the ground, this time at a U.S. Immigration and Customs Enforcement facility in Dallas where a detainee was killed and two o...

None of the people shot were members of law enforcement and the shooter is dead from a self-inflicted gunshot wound, according to Homeland Security Secretary Kristi Noem.