History Of Cuba

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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. But the recordings have not significantly advanced U.S. knowledge about what is harming diplomats.

Officials say the government still doesn't know what or who is responsible for injuries to its personnel, but the U.S. has faulted Cuba for failing to protect American personnel on its soil. President Donald Trump's chief of staff, John Kelly, said Thursday in response to a question: "We believe that the Cuban government could stop the attacks on our diplomats."

The Navy and the State Department did not respond to requests for comment on the recording.
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"What it is telling us is the sound is located between about 7,000 kHz and 8,000 kHz. There are about 20 peaks, and they seem to be equally spaced. All these peaks correspond to a different frequency," said Kausik Sarkar, an acoustics expert and engineering professor at The George Washington University who reviewed the recording with the AP.

Those frequencies might be only part of the picture. 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. Investigators have explored whether infrasound or ultrasound might be at play in the Havana attacks.

The recordings have been played for workers at the U.S. Embassy to teach them what to listen for, said several individuals with knowledge of the situation in Havana. Some embassy employees have also been given recording devices to turn on if they hear the sounds. The individuals weren't authorized to discuss the situation publicly and demanded anonymity.

Cuban officials wouldn't say whether the U.S. has shared the recordings with Cuba's government.

Another big question remains: Even if you know you're under attack, what do you do? Still dumbfounded by what's causing this, the United States has been at a loss to offer advice.

The embassy's security officials have told staff if they believe they're being attacked, they should get up and move to a different location, because the

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