Fewer Americans are concerned about international terrorism as a “critical” threat to the United States than at any point since September 11, 2001.

Six people were killed when a gunman attacked a Sunday service at a Sikh temple in Wisconsin on Sunday; three are still in critical condition.

Air Canada has heightened security precautions after a passenger on a flight bound for Toronto earlier this week discovered a needle in a catered sandwich.

The New York Police Department will soon launch an all-seeing “Domain Awareness System” that combines several streams of information to track both criminals and potential terrorists.

Just after Batman shootings, two of the suspect's university campus buildings were evacuated of nonessential personnel on order of the university's police chief. Law enforcement fears potential of copycat actions.

Think that a top U.S. bioterror lab would know to lock its doors...but internal emails describe repeated, potentially dangerous security lapses.

A Saudi Arabian citizen Wednesday, June 27 was convicted of attempting to use chemicals to build a weapon of mass destruction. One target was the home of a former U.S. President.

While MI5 director general Jonathan Evans is not naive about the terrorist threat against London, he is confident in the measures in place.

Evidence suggests that the crash of an SUV into a downtown Washington office building last Friday may be linked to a plan to blow up the vehicle inside the building.

A San Diego man was removed from the United Express plane just moments before its departure time after he boarded without being screened and without a ticket.