(CNN) US Secretary of State Mike Pompeo said Wednesday that an incident involving a US government employee stationed in China who reported "abnormal sensations of sound and pressure" suggesting a mild brain injury has medical indications that are "very similar" and "entirely consistent" to those experienced by American diplomats posted in Havana.

US officials have issued a health alert in China following the incident. Additionally, the US State Department is looking into whether the incident is similar to what happened in Cuba in 2016 and 2017, a US diplomatic official told CNN, which the US government characterized as a "sonic attack." That incident led to a reduction in staffing at the US Embassy in Havana.

The official who fell ill was assigned to the city of Guangzhou in southern China and reported a range of physical symptoms from late 2017 through to April 2018, the State Department said. The employee was sent back to the United States for assessment.

The US Embassy in Beijing learned on May 18 that the clinical findings of the evaluation matched that of a "mild traumatic brain injury," an embassy spokeswoman told CNN.

Pompeo said the State Department is moving medical teams into place in Guangzhou and has asked for assistance from the Chinese government, which has committed to providing it.

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