NPR
Ambassador Zalmay Khalilzad on Ayman al-Zawahiri
Almost 21 years after 9/11, the mastermind of those attacks is dead. A U.S. drone strike killed al-Qaida leader Ayman al-Zawahiri on Sunday morning in Afghanistan. The intelligence community tracked his location to a safe house right in the middle of Kabul. STEVE INSKEEP, BYLINE: It's a house in the...