A simple, two-tiered alert system will warn of possible terror attacks. The new warnings replace much-maligned colored alerts.

Antonio Cooper Sr. walked across a field of empty chairs that represent the victims of the Oklahoma City bombing, occasionally stopping to read names inscribed in glass panes as he searched for the one dedicated to his 6-month-old son, Antonio Cooper Jr.

Mississippi Gov. Haley Barbour is embracing his background as one of Washington's top lobbyists, saying his powers of persuasion would be an asset if he wins the White House.

Twitter, Facebook, Google, YouTube play increasingly important role during disasters.

Nine days after Japan's catastrophic earthquake, two urgent pleas for help appeared on the Twitter stream of U.S. Ambassador John Roos:

Japan's nuclear crisis shows how a little information can become a very dangerous thing.

The U.S. government has prevented more than 350 people suspected of ties to al-Qaeda and other terrorist groups from boarding U.S.-bound commercial flights since the end of 2009, The Associated Press has learned.

Driven by social media and mobile startups, the money is flowing in the city's tech industry again, a decade after the dot-com boom.

Internal e-mails from the Nuclear Regulatory Commission revealed doubts about procedures for U.S. plants in a Fukushima-style event.