U.S. government suspicions about microwave weapon attacks have apparently spread to the Department of Homeland Security. DHS Deputy Under Secretary for Management Randolph D. Alles sent a memo to department personnel encouraging them to report "unexplained health incidents" to medical officials within DHS or to the State Department. The memo suggests that concerns about "multiple symptoms following an unusual auditory or sensory event," in the past limited to the State Department and CIA, have spread to DHS, an agency unlike the other two in that its operations are primarily domestic. Claims of mysterious health problems, mostly neurological, first originated among several State Department diplomats in Cuba in 2016 " earning the broad range of symptoms the moniker "Havana Syndrome." The reported injuries ... are said to have affected over 130 people. The DHS memo itself notes, "The precise nature of the injuries suffered by affected personnel has varied and whether a common cause exists for all individuals, regardless of location, has not yet been established." A National Academies of Science report last year ... concluded that the symptoms are real, and the most plausible cause is "directed, pulsed radio frequency energy." Former CIA officials ... broadly agreed on the existence of Havana Syndrome but not on its perpetrator, which has been variously attributed in speculation to the Chinese, Russian, or Cuban governments.