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Al Qaeda leader Ayman al-Zawahiri was killed in a US strike in Afghanistan over the weekend, the biggest blow to the militant group since its founder Osama bin Laden was killed in 2011.
Burns, tapped by US President Joe Biden as the first career diplomat to serve as CIA chief, said in a National Public Radio interview that he has bolstered his agency's efforts to determine the cause of the syndrome and what is responsible.
South Korean and US officials have said the North Korean authorities had ordered the assassination of Kim Jong Nam, who had been critical of his family's dynastic rule.
Jerry Chun Shing Lee was approached in 2010 by two Chinese intelligence officers who offered to pay him $100,000.