May 22, 20137:13 PM ET

WASHINGTON (AP) — The Obama administration acknowledged for the first time Wednesday that four American citizens have been killed in drone strikes in Pakistan and Yemen since 2009. The disclosure to Congress comes on the eve of a major national security speech by President Barack Obama in which he plans to pledge more transparency to Congress in his counterterrorism policy.

May 22, 20135:23 PM ET

LONDON (AP) — In a brutal daylight attack which raised fears that terrorism had returned to London, two men with butcher knives hacked another man to death near a military barracks Wednesday before police wounded them in a shootout.

May 22, 20136:30 PM ET

WASHINGTON (AP) — At the center of a political storm, an Internal Revenue Service supervisor whose agents targeted conservative groups swore Wednesday she did nothing wrong, broke no laws and never lied to Congress. Then she refused to answer lawmakers' further questions, citing her Fifth Amendment right not to incriminate herself.

May 22, 20135:52 PM ET

ORLANDO, Fla. (AP) — A Chechen immigrant was shot to death by authorities early Wednesday after he turned violent while being questioned about his ties to one of the Boston Marathon bombing suspects, officials said.