An increase in terror incidents involving Islamic radicals who are U.S. citizens is vexing law enforcement officials and posing new questions about the roots of their radicalization.

Ayman al-Zawahiri, now America’s most wanted terrorist, took over as the head of al-Qaeda in June 2011 after the killing of erstwhile head Osama bin Laden.

The reliance on unmanned drones to target terror suspects in Pakistan has been quietly lauded by U.S. officials. But the covert program, which has so far gotten little public scrutiny, is facing moun…

U.S. experts say any new approach to bringing stability to Afghanistan must be regional in scope. Saudi Arabia, with historic ties to the Taliban and Afghan Pashtuns, could hold a principle seat at t…