By Idrees Ali and Jeff Mason WASHINGTON (Reuters) – The United States killed al Qaeda leader Ayman al-Zawahiri in a strike in Afghanistan over the weekend, President Joe Biden said on Monday, the biggest blow to the militant group since its founder Osama bin Laden was killed in 2011. Zawahiri, an Egyptian surgeon who had a $25 million bounty on his head, helped coordinate the Sept. 11, 2001, attacks that killed nearly 3,000 people. U.S. officials, speaking on the condition of anonymity, said Zawahiri died after a U.S. drone strike in the Afghan capital Kabul at 6:18 a.m. (0148 GMT) on Sunday. …

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