US Department of State spokeswoman Heather Nauer said staff began complaining of the unusual symptoms late a year ago. Personal harm to US officials shows the extent the Castro regime will go and clearly violates global norms.
Given Trump's aggresive posture against the Cuban regime - and thorn of his comments about Castro's crimes - the fact that a more aggessive response from the U.S.to what amounts to an attack of USA diplomats in Cuba does not add up.
Based on statements from officials with knowledge of the situation, an investigation into the circumstances of this odd phenomenon has been ongoing throughout 2017.
"Personal harm to USA officials shows the extent the Castro regime will go and clearly violates global norms".
It's in response to a series of incidents that left American diplomats in Cuba with physical symptoms.
USA investigators have concluded that the country's diplomats were being hit with an advanced device that can send out sound that is inaudible but can cause huge damage to the ears of a person around them, which appears to have been left either inside or near the diplomats' houses.
Some subsequently got hearing aids, said the official, who spoke on condition of anonymity.
According to The Associated Press, the affected Americans were complaining of hearing loss. In her cagey comments yesterday, Nauert would only refer to an "incident" in which diplomats experienced "physical symptoms".
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"We don't have any definitive answers about the source or the cause of what we consider to be incidents", Nauert said.
"What this requires is providing medical examinations to these people", Ms Nauert said. She added that they are "monitoring it", and providing any necessary medical care.
Canada's foreign ministry is investigating after at least one of its diplomats stationed in Cuba was treated for hearing loss and headaches.
Global Affairs Canada spokeswoman Brianne Maxwell said Canadian officials "are aware of unusual symptoms affecting Canadian and U.S. diplomatic personnel and their families in Havana".
"The Cuban government has been harassing U.S. personnel working in Havana for decades", he said.
"It is a cause of great concern for us", she said. "I'm not going to call it as such, but we asked two people to go home".
"The Cuban authorities set up an inter-institutional expert committee for the analysis of the facts; expanded and reinforced the protection and security measures of the mission, its staff and diplomatic residences; and new channels were made available for direct communication between the Embassy and the Department of Diplomatic Security", the ministry said.
According to Havana, the Cuban Ministry of Foreign Affairs was notified by Washington on February 17, after which the island's government promptly responded speedily and professionally, launching a "thorough, priority and urgent investigation by indication of the highest level of the Cuban government" while proposing the establishment of a cooperation mechanism between the two countries.