PETA asks Pentagon to cease animal testing related to 'Havana syndrome'

The animal rights group PETA sent a letter to the Pentagon on Monday, demanding that they cease testing on live animals in their quest to understand the mysterious ailments known as "Havana syndrome." 

Havana syndrome was first reported in 2016 by diplomats working at the U.S. embassy in Cuba, who reported a strange set of symptoms ranging from cognitive problems to hearing and vision loss. Since then, hundreds of other U.S. personnel around the world have experienced similar ailments. 

The Office of the Director of National Intelligence concluded in a report earlier this month that it is "very unlikely" a foreign adversary is responsible for the symptoms, attributing them instead to "preexisting conditions, conventional illnesses, and environmental factors."