But what remains unknown is what kind of device may have been used, where exactly it was placed, and who put it there.
Investigators continue to examine the circumstances surrounding as many as 50 attacks believed to have been carried out against the diplomats, a senior US official has told CNN.
For months, starting late last year, US diplomats in Havana complained of incidents, often late at night in their homes or hotel rooms, that left them feeling ill -- often plagued by a sudden wave of nausea, dizziness and headaches accompanied by strange sounds compared to loud insects or metal dragging across the floor.
Questions also continue to swirl around the Cuban government's involvement in the attacks, given that experts say the country likely lacks the scientific expertise to launch such a sophisticated operation.
On Thursday, President Donald Trump's chief of staff, John Kelly, did not directly accuse the Cuban government of carrying out the attacks but told reporters: "We believe the government could stop the attacks on our diplomats."
"The question that nobody seems to be asking is why would the Cubans do such a thing?" said Steven L. Garrett, who taught acoustics at Penn State University before retiring last year.
A US official told CNN this week that they are investigating whether a third country was involved as "payback" for actions the US has taken elsewhere and to "drive a wedge between the US and Cuba."
"The Cubans are not known for sophistication in physical and engineering acoustics," Garrett said.
But Garrett did note who he felt was ultimately behind the attacks citing Russia's long-standing specialization in non-linear acoustics.
"The fact that the focus is on acoustic source, then my money would be on Putin," he said, referring to Russian President Vladimir Putin.
While Russia's focus on non-linear acoustics was focused on underwater applications, Garrett said they, along with a handful of other advanced nations -- including Germany and France -- maintain the scientific infrastructure to develop a device capable of manipulating acoustics in the air.
"Putin likes sowing chaos and his acoustics establishment has the requisite technical expertise," he said.
The unnerving mix of high-pitched tones in the recording is similar to descriptions made by diplomats that were in Cuba at the time of the attacks, and the audio file has sparked interest among a community of acoustic experts after it was analyzed by, Kausik Sarkar, an acoustics expert and engineering professor at George Washington University.
While the sound heard in the recording seems to be similar to descriptions provided by US embassy workers in Havana, Sarkar told CNN that the audio file raises more questions than answers around claims that a sonic weapon could have been used in the attacks.
Sarkar told CNN that he conducted a spectrum analysis of the audio file that was recorded on a cellphone -- a point he stressed would limit the ability to actually determine the sound's...
Read More: New audio adds to mystery of attacks on US diplomats