The United States has officially stopped issuing visas for travel to Cuba indefinitely after more than half of the embassy staffers in Havana were pulled out due to a string of sonic attacks.

The attacks occurred in residences and hotels frequently used by Americans.

West New York Mayor Felix Roque is from Cuba and presides over the largest Cuban population in New Jersey. He says he agrees with the president's visa decision.

"I have a feeling this is an experiment gone wrong," Roque says. "They mussed up, and they hurt people...It cannot be a coincidence. More than 20 diplomats, hearing loss, ear damage, you can't do that."

Cuba has denied any involvement in the attacks, and United States officials have not blamed Cuba, either.

President Donald Trump said that in Cuba "they did some very bad things" that harmed U.S. diplomats, but he didn't say who he might mean by "they." 

In some cases, diplomats said they heard loud sounds in specific parts of their homes or hotels. Some of the sounds reportedly included insects or metal dragging across the floor. To medical investigators' dismay, symptoms have varied widely. In addition to hearing loss and concussions, some people have experienced nausea, headaches and ear-ringing. The Associated Press has reported some now suffer from problems with concentration and common word recall.