U.S. Embassy workers in Havana appeared to be deliberately targeted by the sound. (AP Photo/Desmond Boylan, File)
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The Associated Press has obtained a recording of what some U.S. Embassy workers heard in Havana in a series of unnerving incidents later deemed to be deliberate attacks. The recording, released Thursday by the AP, is the first disseminated publicly of the many taken in Cuba of mysterious sounds that led investigators initially to suspect a sonic weapon.The recordings from Havana have been sent for analysis to the U.S. Navy, which has advanced capabilities for analyzing acoustic signals, and to the intelligence services, the AP has learned.The AP has reviewed several recordings from Havana taken under different circumstances, and all have variations of the same high-pitched sound. Individuals who have heard the noise in Havana confirm the recordings are generally consistent with what they heard. Then there would be silence for a second, or 13 seconds, or four seconds, before the sound abruptly started again.A closer examination of one recording reveals it's not just a single sound. Conventional recording devices and tools to measure sound may not pick up very high or low frequencies, such as those above or below what the human ear can hear.Cuban officials wouldn't say whether the U.S. has shared the recordings with Cuba's government.
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