The government will not send American staff back to the US Embassy in Havana yet, a US official told Reuters on Tuesday amid concerns over what Washington calls attacks that have sickened two dozen diplomats.
Although the US has not formally accused the Cuban government of being responsible for the health problems that affected 24 US diplomats and family members in the past 18 months, President Donald Trump has said Havana was to blame. Cuba has denied the charges.
The US government says victims have suffered hearing loss, dizziness, fatigue and cognitive issues. Washington reduced its embassy to a skeleton staff in September.
Secretary of State Rex Tillerson told the Associated Press last week that he was not convinced "deliberate attacks" are over.
"There is no way you can conduct sophisticated attacks targeting American government officials without the Cuban government at least knowing about it," Senator Marco Rubio said.
(Agencies)