A member of the CIA director's team experienced symptoms of the mysterious 'Havana Syndrome' on a trip to India, report says

• A member of CIA director Bill Burns team reported symptoms of Havana Syndrome this month, CNN said.
• The incident happened on Burns' trip to India and left him "fuming," sources told CNN.
• At least 130 US personnel have reported symptoms, including in China, Vietnam, the US, and Russia.

A colleague of CIA Director Bill Burns experienced symptoms consistent with the mysterious "Havana Syndrome" during a recent trip to India, CNN reported.

The incident happened earlier this month and left Burns "fuming" with anger, a source told CNN. Employees of the CIA told the outlet that the episode was perceived internally as a direct threat to Burns.

The individual who reported the symptoms was returned to the US and recieved immediate medical attention, CNN reported. The CIA did not immediately respond to Insider's request for comment.

The first instance of the so-called "Havana Syndrome" was reported in late 2016 by US officials and employees in Cuba who reported headaches, vertigo, hearing loss, and noticed buzzing or clicking sounds.

At least 130 US personnel have reported symptoms following other incidents in China, Russia, Germany, and the US.

Marc Polymeropoulos, who experienced the symptoms in December 2017 while working for the CIA in Moscow, told Insider's Aylin Woodward in a story published earlier this year: "I couldn't drive. I lost my long distance vision. I had brain fog. And honestly, the headaches that I developed, I still have to this day."

Last month, Vice President Kamala Harris' trip to to Vietnam was delayed after American officials in Hanoi reported symptoms of the illness. Two people were medevaced.

In June, President Joe Biden backed the formation of two panels to investigate the cause of the illness and, in early September, Defense Secretary Lloyd Austin sent a note to 2.9 million military service members and contractors telling them to make themselves known if they had experienced any symptoms.

The cause of the syndrome is unknown, but theories include microwave energy, ultrasound, and infectious toxins.

The US intelligence community is conducting its own investigation into the mysterious illness, with a report due by the end of the year, CNN reported.