U.S. Diplomats and Spies Battle Trump Administration Over Suspected Attacks

WASHINGTON — The strange sound came at night: a crack like a marble striking the floor of the apartment above them. Mark Lenzi and his wife had lightheadedness, sleep issues and headaches, and their children were waking up with bloody noses — symptoms they thought might be from the smog in Guangzhou, China, where Mr. Lenzi worked for the State Department. But air pollution could not explain his sudden memory loss, including forgetting names of…