Hear the Mysterious 'Sonic Attack' That Left 20 Americans Hurt in Cuba
Some embassy workers in Havana say this is the sound they heard during a supposed "sonic attack."
A recording has emerged of what American embassy workers in Cuba claim to have heard during what some have billed as a "sonic attack."
The recording, released by The Associated Press on Thursday, is one of many taken in Cuba since the supposed attacks started last year.
Watch: Obama Meets With Raul Castro in First Presidential Visit to Cuba in 88 Years
Since then, at least 22 Americans have been "medically confirmed" as affected, although the cause — and who might be behind it — is not yet clear.
Cuba has denied involvement in any attacks. The U.S. has not assigned any blame.
In the recording, pulses seem to come in varying lengths with sustained periods that are minutes long.
While some of the affected Americans reported hearing the sounds — often coming from isolated spots in a room — not all those who've been sickened reported hearing sounds.
It is also not clear whether the afflicted Americans heard the same sound, The AP reports.
Watch: Donald Trump: Cuban Leader Raul Castro Has No Respect for President Obama
The U.S. says those affected experienced issues with hearing, cognitive, visual, balance, sleep and other problems.
The attacks started last year and have been ongoing, with one an incident reported as recently as late August.
Watch: Cuban Woman Sheds Tears of Joy After Castro's Death
Trending on Inside Edition

Some Fear High School Baseball Star Who Vanished After Going Overboard on Sunset Cruise Was Attacked by Shark
Human Interest
Former Sheriff's Deputy Sentenced for Killing 'Extramarital' Girlfriend Who Insulted 'Size of His Manhood': DA
Crime
New Mom Survives After Contracting Rare Flesh-Eating Bacteria Days After Giving Birth
Health
After Getting Shot in the Head for Ringing Wrong Doorbell, Ralph Yarl Walks for Brain Injury Awareness
News