It's unclear who is behind all of this. Moreover, the State Department also issued a travel warning, cautioning Americans not to travel to the island, as they might be at risk of some of the attacks against diplomats.
The complaints from diplomats began in December 2016 and have continued since with 21 employees complaining of symptoms like headache, nausea and hearing loss among others.
Here are a few answers to questions readers may have about this escalating problem and mystery.
No one has any idea what is going on or what could be causing these problems.
U.S. Sen. Marco Rubio, R-Fla., said he does not believe Cuban officials' claim about the attacks. A spokesman for the United States embassy in Havana declined to comment. A State Department travel warning will note that attacks on diplomats have occurred in hotels.
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Some diplomats heard various loud noises or felt vibrations during the attacks, others heard nothing but reported symptoms later.
Likewise, he told him that according to the preliminary results obtained by Cuban authorities in their investigation, which has taken into account data provided by the USA, there is no evidence of the causes and origin of health problems reported by US diplomats.
Since the FBI took over the investigations, there has been no word from the agency, on its preliminary findings.
Do authorities have any theories about the cause?The type of acoustic weapon that was possible used on the diplomats is now unknown, if one was even used at all.
How have US officials and leaders reacted?
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The State Department said embassy employees have been "targeted in specific attacks" and that the withdrawal aims to reduce the number of USA personnel at risk of exposure. It's a very serious issue with respect to the harm that certain individuals have suffered. "We've brought some of those people home".
The blaring, grinding noise jolted the American diplomat from his bed in a Havana hotel.
Tourists drive in a vintage auto past the U.S. Embassy while on a sightseeing tour through Havana on December 18, 2015.
Over the last two years, USA airlines have begun direct flights to Cuba, tourism has surged and numerous travel and commerce restrictions were lifted. Further, the US will stop issuing visas within the country, "effective immediately".
Could these mysterious attacks put a damper on U.S.
Meanwhile, some critics argue that the new measure by the Trump administration comes as an effort to tighten relations with the communist country.
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