Concealable devices with ‘modest energy requirements’ which could emit pulsed electromagnetic energy and ultrasound exist

A US intelligence report by a panel of expert scientists has named pulsed electromagnetic energy and ultrasound as plausible causes for the mystery Havana Syndrome symptoms suffered by US diplomats and spies in recent years.

The report found that a group of cases could not be explained by health or environmental factors or by psychosomatic illness. It also said that devices exist with “modest energy requirements” which were concealable and could produce the observed symptoms and be effective over hundreds of meters or through walls.