The new intelligence assessment caps a years-long effort by the CIA and several other U. Five of those agencies determined it was “very unlikely” that a foreign adversary was responsible for the symptoms, either as the result of purposeful actions — such as a directed energy weapon — or as the byproduct of some other activity, including electronic surveillance that unintentionally could have made people sick, the officials said. Spratlen declined to say whether she believed the FBI study was accurate, angering diplomats who say their symptoms are the result of an attack, said people familiar with the matter