US officials in Cuba rushed to Miami

Many diplomats have been rushed home to Miami for treatment after suffering from mysterious symptoms.
1:56 | 08/23/17

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Transcript for US officials in Cuba rushed to Miami
To the mystery deepening. We have reported on several U.S. Officials working in Cuba, suffering symptoms so serious they were rushed home for treatment. At one point, it was blamed on some sort of sonic device. Well, today the state department is being asked did anyone suffer from traumatic brain injury? Tonight's Victor Oquendo tonight. Reporter: Tonight new details about the mysterious illness that sickened American officials in Cuba. This is unprecedented. We have not seen this type of activity take place before. Reporter: The state department revealing today that some of those Americans had to be medically evacuated to Miami for treatment and testing. The best equipment is not going to necessarily be on the ground in Cuba. We are bringing people to the best medical experts on the mainland in the United States. Reporter: Starting in December of 2016, sources say it appears some officials were exposed to a sonic device in Havana that caused serious health problems and physical symptoms including hearing loss. Now sources are telling our Miami station those symptoms included memory loss, loss of balance and vision issues. Experts tell ABC news that sound waves above and below the range of human hearing could potentially cause permanent damage. The state department today pressed on a report that some officials were diagnosed with injuries as severe as brain injury. I'm not going to confirm the medical status of any U.S. Government personnel. But what has happen there is of great concern to the us government. Reporter: The U.S. Has responded by expelling two Cuban diplomats earlier this year. The secretary of state recently calling it an attack and demanding answers. We hold the Cuban authorities responsible for finding out who is carrying out these health attacks on not just our diplomats, but as you've seen now there are other cases with other diplomats as well. Reporter: David, the Cuban government has denied any involvement. Right now U.S. Officials say they have no idea what this was or who was behind it, David. Victor Oquendo in Miami.

This transcript has been automatically generated and may not be 100% accurate.

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