Chris Maddaloni/CQ Roll Call(WASHINGTON) -- Attorney General Eric Holder has disclosed in a letter to Congress that four Americans were killed by U.S. drones in the course of the government's attacks on terrorists.

"Since 2009, the United States, in the conduct of U.S. counterterrorism operations against al Qaida and its associated forces outside of areas of active hostilities, has specifically targeted and killed one U.S. citizen, Anwar al-Aulaqi," Holder wrote.

"The United States is further aware of three other U.S. citizens who have been killed in such U.S. counterterrorism operations over that same...

Geoff Legler/Oklahoma National Guard via Getty Images(MOORE, Okla.) -- Six adults remain unaccounted for after the devastating tornado that tore through Moore, Okla., Monday, killing 24 people and destroying as many as 13,000 homes, officials said Wednesday.

Authorities are working to determine whether the missing adults are buried in the rubble or simply "walked off," Oklahoma Department of Emergency Management Director Albert Ashwood told reporters.

Of the 24 confirmed deaths, 23 people have been identified. Ten of the victims were children, according to a report issued Wednesday by the state Medical...

Craig F. Walker/The Denver Post(DENVER) -- Colorado Gov. John Hickenlooper has indefinitely delayed the execution of convicted killer Nathan Dunlap, saying that he had doubts about the death penalty, much to the dismay of victims' families and a furious district attorney.

The killing of four employees in a Chuck E. Cheese's in 1993 was a massacre that scarred the people of Aurora, Colo., long before shooter James Holmes opened fire in a crowded movie theater on July 20, 2012. Holmes killed 12 and wounded dozens more.

Dunlap, 38, is one of three men...

Vector ManagementTrisha Yearwood was one of several artists invited to the White House Wednesday night to pay tribute to Carole King, who was honored by President Obama and awarded the Library of Congress Gershwin Prize for Popular Song.

Obama remarked, "For an entire decade, behind so many of the songs that touched our hearts and stirred our soul, there was Carole forever joyful and uplifting."

Several artists paid tribute to King by performing her music, including Billy Joel, James Taylor, Gloria Estefan, Emeli Sande and Yearwood.

The highlights included Joel performing "Locomotion," Taylor playing "Up on...

Burke/Triolo Productions/ThinkstockBrett Eldredge is CMT's current Listen Up featured artist, and you can learn more about him at ListenUp.CMT.com.

Keith Urban has released the lyric video for his new single, "Little Bit of Everything."

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ABCNow that Kellie Pickler has won this season of Dancing with the Stars, she's ready to get back to her first love -- making music.  Kellie just released her new country single, "Someone Somewhere Tonight," to radio.

She tells ABC News Radio, "I'm really excited about getting back in the studio 'cause I started working on my record before we started the show, and I've only been able to get in the studio a couple times since then 'cause we've been so busy in the dance studio."

Kellie expects her...