The department's statement comes as Washington has issued a health warning to American citizens in China after the US diplomatic employee in China reported "subtle and vague, but abnormal, sensations of sound and pressure", according to the press service of the US Embassy in China.
The US State Department has said that at least 24 individuals working at the US Embassy in Havana experienced health effects caused by these purported attacks.
The Post reports that Chinese and United States officials are looking into the matter.
The Canadian government in April said it would remove families of diplomats posted to Cuba after Canadian personnel there in 2017 also reported similar health symptoms.
An employee of the US government in Guangzhou, China, has reported mysterious symptoms similar to those experienced by State Department employees in Cuba. According to medical records first obtained by CBS News, a USA doctor diagnosed the American diplomats as suffering from mild traumatic brain injury.
It added: "If you experience any unusual acute auditory or sensory phenomena accompanied by unusual sounds or piercing noises, do not attempt to locate their source".
"The clinical findings of this evaluation matched mild traumatic brain injury (MTBI)", the embassy said.
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Emily Rauhala, the Washington Post's China correspondent reported that the State Department confirmed the embassy employee had been diagnosed with mild traumatic brain injury, which USA officials in Cuba also experienced. The mployee was sent back to the United States for assessment.
For most the symptoms occurred around May 2017, but they were first reported in late 2016. "Instead, move to a location where the sounds are not present", it says, urging people with medical problems to consult a doctor.
"We can not at this time connect it with what happened in Havana, but we are investigating all possibilities", a U.S. embassy official said.
A year ago in Cuba, the U.S. reported that some of its personnel and family members experienced a range of ailments, some after hearing an unusual sound.
In the Cuba incident past year, 21 people fell sick with injuries including hearing loss, cognitive issues and sleep difficulties in what the State Department called an "attack".
"The medical indications are very similar and entirely consistent with the medical indications that have taken place to Americans working in Cuba", Pompeo told the House Foreign Affairs Committee.
The cause of those incidents remains unresolved.