Did U.S. forces overstep authority in Afghan strike?
Obama said force could be used under 3 specific circumstances, and it's unclear if any were met before deadly hospital strike
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Obama said force could be used under 3 specific circumstances, and it's unclear if any were met before deadly hospital strike
The $500-million program had once been a linchpin of the strategy to defeat ISIS but has proved a fiasco
Central Command says U.S.-trained Syrian rebel leader "apparently" gave trucks and ammunition to Nusra Front, the al Qaeda affiliate in Syria
Two men found guilty of plotting to derail a passenger train in Canada were convicted earlier this year
American effort to put allies on the ground inside Syria dealt another apparent blow, and al Qaeda claims they were gifted U.S. weapons from them
Activists say development effectively expels last of Assad's military from northwestern province of Idlib
Defense Secretary Ash Carter still believes training and equipping moderate Syrian rebels to fight ISIS is the right strategy, spokesman says
United Arab Emirates forces free 64-year-old petroleum engineer who had been kidnapped by militant group in February 2014
Nusra Front praised as "brothers" by group of fighters the U.S. hopes will be a spearhead for it in the chaos in Syria
Ayman al-Zawahiri weighs in on militant group's new leader amid apparent rift within Taliban
Abdella Ahmad Tounisi, 21, was arrested in 2013 after he contacted undercover agents on fake extremist websites
Nusra Front pulling out of area where U.S. and Turkey hope to drive out extremists
"Direct your spears towards America..." says senior leader; "Lone wolf jihad... will always be a strategic weapon."
Afghanistan authorities say Mullah Mohammed Omar, the one-eyed figurehead of the Taliban, has been dead for more than two years
Long-persistent rumors that reclusive one-eyed cleric died years ago are credible, White House says
Arriving in his ancestral fatherland with a big infusion of investment money, President Obama looks to boost trade and human rights, and tackle terrorism
Obama was greeted in Nairobi by family members -- and heightened security amid terror fears
President will be in his father's native country of Kenya, and in Somalia, with security and trade high on the agenda
Hundreds of investigations have been opened across all 50 states focusing on targets who have received messages from extremist group
Muhsin al-Fadhli's death in Syria seen as a significant blow against the al Qaeda faction, which has been actively plotting against U.S., West
At least nine soldiers killed in attack in rugged, rural province that comes after the army had a string of successes
As nation reflects on suicide blasts that killed 52 on trains and a bus, spy chief warns threat still posed by "tiny fraction of the population"
There are several challenges presented by ISIS changing the way the U.S. approaches national security, Mike Morell says
The U.S. killed the head of al Qaeda in the Arabian Peninsula in a strike in Yemen
High-ranking leader Nasir al Wuhayshi confirmed killed by U.S. drone strike in Yemen