Watching al-Qaida chief’s ‘pattern of life’ key to his death

WASHINGTON — As the sun was rising in Kabul on Sunday, two Hellfire missiles fired by a U.S. drone ended Ayman al-Zawahri’s decade-long reign as the leader of al-Qaida. The seeds of the audacious counterterrorism operation had been planted over many months. U.S. officials had built a scale model of […]