An audio recording of the high-pitched sound that American intelligence officials believe caused U.S. diplomats in Cuba brain damage was released Thursday afternoon.

The Associated Press released the first publicly disseminated recording Thursday. The first of many audio recordings taken in Cuba has led U.S. intelligence operatives to believe the Cuban government is using an unknown sonic device to attack Americans and other foreigners on the island.

The U.S. Navy is currently investigating the strange recording, hoping to glean some information about what is harming American diplomats in Cuba.

Victims often described a sound similar to chirping crickets before experiencing any symptoms, but not all of the attacks have produced an audible sound. Some were described as inaudible, which is causing some concern among investigators who believe the attackers are developing, or even already employing, more sophisticated methods.

The U.S. has confirmed 21 cases, and American intelligence operatives incurred arguably the worst damage reported thus far. U.S. spies have suffered brain damage, unrelenting hearing loss and other severe outcomes.

Reports of ongoing, mysterious attacks befalling U.S.-government personnel and other foreign citizens in Cuba are complete “nonsense” and “without evidence,” Cuban Vice President Miguel Díaz-Canel said Sunday.

“Some unnamed officials are propagating unusual nonsense without any evidence, with the perverse aim of discrediting the impeccable reputation of our country as a safe destination for foreign visitors, including from the United States,” Diaz-Canel, the likely successor to Cuban President Raúl Castro, said Sunday.

Castro has also rejected any notion that the Cuban government is behind the attacks.

The U.S. Department of State has responded to the reported attacks, ordering all nonessential personnel in Cuba to evacuate the island. The State Department also issued a travel warning for all Americans not to visit the island nation until the attacks are resolved.

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