Colorado lawmakers have adopted more than two dozen new laws regulating the sale, purchase, possession and carrying of guns since the 2012 Aurora movie theater shooting. Here’s a timeline.

LAS VEGAS -- The gunman who killed four people before taking his own life in a midtown Manhattan office building that houses the NFL's headquarters had for years sought medical help for frequent, ...

During evening rush hour in New York City on Monday, a man calmly walked into a Park Avenue office building lobby and killed ...

When I got here, business was great,” one Colorado gun store owner said. “And now they’re just trying to put up all these ...