
Top al-Qaida leader and key 9/11 plotter Ayman al-Zawahiri was killed by a drone strike carried out by the U.S. on July 30, according to President Joe Biden.
"For decades he was the mastermind behind attacks against Americans," Biden said on Aug. 1, also noting the 2000 USS Cole attack and the 1998 bombings of the U.S. embassies in Kenya and Tanzania.