HAVANA — Republican Sen. Jeff Flake says the U.S. has found no evidence that American diplomats in Havana were the victims of attacks with an unknown weapon.

Flake, a Senate Foreign Relations Committee member, met with high-ranking Cuban officials in Havana on Friday. He spoke with The Associated Press on Saturday morning.

The Cubans told Flake the FBI has told them its agents found no evidence that mysterious illnesses suffered by U.S. diplomats resulted from attacks, despite the Trump administration’s description of the incidents as attacks. Flake says classified briefings from U.S. officials have left him with no reason to doubt the Cuban account. The U.S. has pulled most of its staff from Havana in response to the incidents.

Cuban and FBI officials did not immediately respond to requests for comment.