Transcript for Americans are warned against traveling to Cuba

Now to the disturbing situation in Cuba American tourists have been warned against traveling there. It comes as the State Department is slashing embassy staff in Havana Holland mysterious attacks targeting US diplomat CBC's Heather Ellis is right here in studio with the latest on the story Stephanie good morning to you. Dan and Paula good morning the State Department is cutting the staff in Cuba by 60%. Cuba is not okay with it but says they'll cooperate with the US. The United States is telling more than half of its staff at its embassy in Cuba to come home the US warning Americans not to visit the Ireland either. This isn't scared and don't Mike S is eating and and I think it it's a good option the decision came Friday in response to mysterious attacks that officials say have affected 21 US diplomats and their families. Investigators say sonic devices may have been used to release sound waves causing harm. We can confirm that at least sixteen. US government employees. Members of our embassy community have experienced some kind of symptoms. The State Department he telling some of those symptoms including your complaint hearing loss dizziness headache fatigue cognitive issues. And difficulty sleeping. Secretary of state Rex Tillerson announce the decision in a statement saying. Until the government of Cuba can ensure the safety of our diplomats in Cuba our embassy will be reduced to emergency personnel in order to minimize the number of diplomats at risk of exposure to harm. Cuba opened its stores to the FBI so they can investigate and came up with nothing only speculation that some kind of sonic weapon may have been used. The very bad things happen they give. Very bad thing. The State Department has made clear it does not blame Cuba for the attacks and will not order Cuban diplomats to leave Washington. At least for now on guys this is scary because police authorities still don't know who exactly. Is responsible for those those attacks could be to keep government. Or in other countries to area mysterious thank you very much really appreciated.

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