VIENNA: Austria and the US said Saturday they were investigating reports of US diplomats and other officials in Vienna falling sick with health problems similar to the so-called "Havana syndrome".

US senators in May said that the government was investigating an apparent increase in mysterious directed-energy attacks, amid new reports of potentially brain-damaging incidents inside the US. The still unexplained attacks have caused sickness and even brain damage in US diplomats and intelligence officials in Cuba, China, Russia and other countries.

Moscow is suspected to be behind them, even if the mechanism for them has yet to be explained. Scientists have theorised that the attacks arise from pulsed microwaves.

Austria and the US said Saturday they were investigating reports of US diplomats and other officials in Vienna falling sick with health problems similar to the so-called "Havana syndrome".

US senators in May said that the government was investigating an apparent increase in mysterious directed-energy attacks, amid new reports of potentially brain-damaging incidents inside the US. The still unexplained attacks have caused sickness and even brain damage in US diplomats and intelligence officials in Cuba, China, Russia and other countries.

Moscow is suspected to be behind them, even if the mechanism for them has yet to be explained. Scientists have theorised that the attacks arise from pulsed microwaves.