But US officials have been unable to definitively identify the source or cause of the symptoms, and Cuban officials have denied any attack. But now, after analyzing the recording, scientists say the source of the piercing noise said to be a "sonic attack" -- described by the diplomats' as "buzzing," "grinding metal" and "piercing squeals" -- could be an echoing call of a cricket. Although the sound on the AP recording comes from a Caribbean cricket, the scientists did not rule out "the possibility that embassy personnel were victims of another form of attack." Nor does it rule out that the diplomats' symptoms were psychosomatic, adding that their health problems were beyond the paper's scope. The US Department of State and federal investigators have been unable to definitively identify the source or cause of these symptoms.

Source: CNN January 07, 2019 15:37 UTC