"It is impossible to conduct 24 separate and sophisticated attacks on US government personnel in Havana without Castro regime knowing about it", Rubio said.
He said investigators and doctors could not find a single cause or explanation for the broad range of medical symptoms, although he ruled out what he called "mass hysteria".
"We reject the politicization of this matter and the unjustified measures that the government of the United States has adopted with a high cost for our population, Cuba emigration and the American people", said Vidal.
"It is incomprehensible to us that [the Cuban government] is not aware who and how and can't take steps to prevent it", Franciso Palmieri, the acting assistant secretary of state for Western Hemisphere affairs, told a Senate foreign relations subcommittee.
All Canadian personnel experiencing symptoms have undergone testing in Canada or the U.S., Global Affairs spokesperson Sujata Raisinghani said on January 4.
The FBI confirmed that there is no evidence of alleged "sonic" attacks in Cuba targeting USA and some Canadian representatives which prompted Washington to recall a number of staff at their Havana embassy.
The unexplained illnesses have roiled already tense diplomatic relations between Washington and Havana; State Department officials say the communist-led government must know who is responsible and how it happened - an accusation Cuban officials have repeatedly denied. But he offered no details or evidence.More news: Aadhaar adds new security layer with 16-digit 'Virtual ID'
More news: European Court of Justice advisors say gay spouses have equal rights
More news: LSU's Derrius Guice entering National Football League draft
Palmieri said the attacks originally were classified as "harassment". "The FBI has said there is no evidence of an attack".
The Trump administration has demanded answers from the Cuban government to no avail. Francisco Palmieri, the acting assistant secretary for the western hemisphere; Todd Brown, diplomatic security assistant director for worldwide programs; and Charles Rosenfarb, medical director of the Bureau of Medical Services. The United States pulled out more than half of its personnel there in September. Marco Rubio (R-Fla.) said today, a few days after Sen.
"I think it's fair to say that whoever did this, did this because they wanted there to be friction between the USA and the Cuban government".
"What we've said to the Cubans is [it's] a small island, you got a sophisticated security apparatus, you probably know who's doing it, you can stop it", Tillerson said in December.
The US government is still baffled by the "perplexing" injuries resembling concussions affecting two dozen US diplomats in Cuba over the last two years, State Department officials told senators at a hearing on Tuesday. It will be in addition to other USA probes, including one by the Federal Bureau of Investigation.
Starting in November 2016, USA government employees began to experience odd symptoms, often late at night and sometimes accompanied by sounds similar to insects chirping or metal grinding, U.S. officials told CNN.
About two years after former U.S. President Barack Obama made a decision to deepen engagement with the Cuban government, American government personnel began showing signs "similar to what might be seen in patients following mild traumatic brain injury or concussion", testified Dr. Charles Rosenfarb, the medical director for DOS's Bureau of Medical Services.