New clues are emerging in the mysterious case of U.S. diplomats in Cuba who experienced health problems after being exposed to an unidentified high pitch sound in their homes. Scientists said Friday that the high pitch sounds, released in a recording by the Associated Press, were made by crickets rather than a sonic or microwave weapon, as some have speculated. In 2016, staff at the U.S. Embassy in Cuba began reporting unexplained symptoms, including hearing loss, dizziness, nausea and memory loss, after hearing the sound. Last month, doctors in Florida said that the diplomats had suffered physical damage to their ears, though the cause of the damage remains unknown. The State Department withdrew much of its diplomatic staff from Havana and expelled Cuban diplomats from the U.S. following what they believe to be a targeted attack.