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In his first remarks to reporters since taking office this month, FBI Director Jim Comey addressed security concerns following the Navy Yard shootings that left 13 people dead. He also talked about sequestration and leaks on government surveillance programs.

Taiwan's president is in the United States as part of a multi-day itinerary that will take the leader of the Asian democratic island through Central and North America.

Gas prices have been soaring. President Biden is announcing he will release oil from the Strategic Petroleum Reserve.

The Drug Enforcement Administration wants to hire prosecutors "to hold accountable the people who are facilitating addiction." Advocacy groups worry the move would exceed the DEA's legal authority.

The antigovernment militant is scheduled to appear in a Boise, Idaho, court Monday on charges stemming from a tense protest that led to the lockdown of one of the state's large hospitals.

U.S. Homeland Security Secretary Michael Chertoff said Thursday that terrorists planned to use liquid explosives to destroy airplanes flying from Britain to the United States. But how do liquid explosives work, and what can security officials do to detect them?

The Phoenix Mars Lander touched down Sunday on the Red Planet without a hitch. Onboard instruments will analyze the ice and look for signs of life at a relatively boring-looking landing site. Joe Palca was at NASA's Jet Propulsion Laboratory in Pasadena, Calif., for the landing.

Wilmington, N.C., on Monday became the first major city to permanently switch TV broadcasts from analog to digital. Most of the country will make the transition to digital TV on Feb. 17.

If the polls are correct, Mauricio Macri will be Argentina's next president. The election of the pro-business mayor of Buenos Aires would be another sign Latin America's "pink tide" may be receding.

Dolphins, like humans, are part of complex social networks. And research now indicates that they use their unique whistle sounds to identify and communicate with each other. "Every time a dolphin heard its signature whistle, it called back, sometimes multiple times," one researcher says.