WASHINGTON — A series of brain injuries and other serious health ailments that struck hundreds of U.S. diplomats and intelligence officials was almost certainly the work of a U.S. adversary, according to a new report by lawmakers, who accuse U.S. intelligence agencies of trying to hide the truth. The ailments, commonly known as Havana Syndrome, but which the U.S. government calls anomalous health incidents, or AHIs, were first publicly reported among diplomats and other employees at the U.S. Embassy in Havana, Cuba, in 2016. Symptoms range from nausea and dizziness to debilitating headaches and memory problems, with cases having been