WASHINGTON (Reuters) – Al Qaeda leader Ayman al-Zawahiri was killed in a U.S. strike in Afghanistan over the weekend, the biggest blow to the militant group since its founder Osama bin Laden was killed in 2011. Zawahiri had been in hiding for years and the operation to locate and kill him was the result of “careful patient and persistent” work by the counter-terrorism and intelligence community, a senior administration official told reporters. Until the U.S. announcement, Zawahiri had been rumored variously to be in Pakistan’s tribal area or inside Afghanistan. Speaking on the condition of ano…

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