National Security | featured news

The U.S. Marine Corps has banned Twitter, Facebook, MySpace and other social media sites from its networks, effective immediately.

Government investigators smuggled bomb-making materials into federal buildings past the police agency charged with protecting those buildings and found numerous other gaps in security, according to a congressional report.

President Obama on Thursday will try to take the reins on the debate over national security and rally support for his plan to shutter the military prison at Guantanamo Bay in what his administration is billing as a major address. In recent weeks, conservative critics have blasted Obama for what they see as missteps on national security.

Federal prosecutors moved Friday to dismiss espionage-related charges against two former pro-Israel lobbyists accused of disclosing classified defense information, ending a tortuous inside-the-Beltway legal battle rife with national security intrigue.

Despite a longstanding policy to alert Congressional leaders quickly if a member could be the target of a security investigation, Alberto R. Gonzales resisted briefing lawmakers on Jane Harman’s wiretap.

­The U.S. national terror alert level is yellow today. Does that mean you can ignore that suspicious ticking package resting by the bus stop or should you report it to the authorities?

Unless you've been living under a rock since the terrorist attacks of Sept. 11, you've probably heard of terror alerts.

Ethnic profiling at the airport:, sadly, is alive and well in the new year.

An unprecedented security operation gets under way ahead of Barack Obama's inauguration as US president on 20 January. Reports suggest more than 20,000 police officers, troops and security agents are involved.