Mexican President Claudia Sheinbaum said she was unaware of the operation and demanded an explanation. WASHINGTON (AP) — Two U.S. officials killed in a vehicle crash as they returned from destroying a clandestine drug lab in a rugged region of Mexico over the weekend were working for the CIA, according to a U.S. official and two other people familiar with matter. Two Mexican investigators also were killed in the crash, which Mexican authorities said occurred while the officials were returning