Domestic Terrorism

The U.S. must be prepared for more attacks by ISIS-inspired loners as the group's battlefield losses mount, officials say.

House and Senate Republicans were locked in an escalating standoff Friday over legislation reining in the National Security...

The Veterans Affairs Medical Center in Orlando is providing emergency mental health assistance to people affected by the...

Defense Secretary Ashton Carter joined warnings from other agencies of the potential for an ISIS terror attack in the U.S...

Trump and Clinton took different tacks in the wake of the deadly attack, while some retired generals called for more gun...

Four Marines were shot and killed Thursday morning in a shooting at two military facilities in Chattanooga, Tennessee.

A U.S. Army Reserve officer was among those killed in the deadliest mass shooting in U.S. history.

Authorities are investigating trips the gunman took to the Middle East as they work to identify the motive behind the...

An Army officer was shot and killed in the Orlando nightclub while a Marine veteran of Afghanistan helped others to escape.

A Navy officer and one of the Marines murdered in last week's attack in Chattanooga fired their personal weapons at the...