By Idrees Ali WASHINGTON (Reuters) -Al Qaeda leader Ayman al-Zawahiri was killed in a CIA drone strike in Afghanistan over the weekend, U.S. officials 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. One of the U.S. officials, speaking on the condition of anonymity, said the CIA carried out a drone strike in the Afghan capital Kabul on Sunday. “Over the weekend, the United States conduc…

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