Domestic terrorism

A gunman killed 11 worshippers at a synagogue because it supports a Jewish aid group that resettles refugees in the U.S. But volunteers refuse to be deterred. "That is who we are," says one.

A civil rights group is highlighting the role of social media in the lives of people who commit acts of violence- like the shooting at a yoga studio in...

At first, many witnesses say, the sharp staccato sounds seemed like part of the nightclub's pounding music. Then they realized: It was gunfire, and it wasn't stopping.

President Obama said that we now know enough about the mass shooting in Orlando to say it was an "act of terror and an act of hate."

Omar Mateen was previously interviewed by the FBI several times over possible ties to terrorism. Authorities say he pledged allegiance to ISIS before attacking a gay nightclub in Orlando, killing 50.

Using a rare Oval Office address, the president called last week's deadly San Bernardino shooting "an act of terrorism" and outlined how the U.S. is working to combat the growing threat from ISIS.

As the U.S. investigates a shooting in California as "an act of terrorism," President Obama will address the nation Sunday night in what will be just his third speech from the Oval Office.