The United States has expelled two Cuban diplomats as federal investigators look into strange illnesses involving US diplomats in Havana.
State department employees in Havana began complaining of hearing loss, constant painful headaches, and other issues late last year.
A source familiar with the matter tells CBS News that U.S. officials are now looking into whether the incidents were caused by a possible type of acoustics device that was in or outside homes of embassy workers provided by the Cuban government.
CBS News has learned as many as 8 or 9 U.S. diplomats had their assignments cut short because of their ailments, but some affected employees still remain on the island.
The development comes just two months after President Trump tightened travel and trade restrictions that were loosened under former President Obama:
Cuba's foreign ministry said that in February it launched an "urgent investigation at the behest of the highest level of the Cuban government" into the incidents, adding that the country would never allow actions against diplomats and their families on its soil.
Sources also tell CBS News a Canadian embassy employee also reported headaches and hearing loss. Security has since been increased around the U.S. embassy and diplomatic homes in Havana.