The United States used two crucial elements of warfare – missiles and intense target surveillance – to track and kill Ayman al-Zawahri, an al-Qaida leader. Al-Zawahri, 71, was killed by two missiles while standing on the balcony of a “safe house” in downtown Kabul, Afghanistan, at 9:48 p.m. EDT Saturday. Al-Zawahri was the successor of Osama bin Laden, the terrorist network leader who was killed in 2011. The missiles, probably modified Hellfire R9Xs, were fired from an unmanned CIA drone in what the White House called “a precise tailored airstrike." U.S. officials described al-Zawahri as a co-planner of the 9/11 attacks. Read the full story at the link in our bio.