The United States says it has sent "a number" of people back home after conducting medical screenings of diplomats and families in Guangzhou, China in response to mystery symptoms suffered by a U.S. government employee.

The State Department issued a health warning last month after the employee reported experiencing "subtle and vague, but abnormal, sensations of sound and pressure" and was diagnosed with a mild traumatic brain injury.

Secretary of State Mike Pompeo described it as a "serious medical incident.''

Spokeswoman Heather Nauert issued a statement late Wednesday saying the department had sent a medical team to Guangzhou to screen all employees and family members who requested it, resulting in an undisclosed number of people being sent to the United States for further evaluation.

Last year in Cuba, the United States reported that some of its personnel and family members experience a range of symptoms, often after hearing an unusual sound, but the cause is still unknown.

美国国务院说，在对驻中国广州的美国外交官及其家人进行体检之后，已经让“若干”人返回美国。此前，一名在中国广州的美国政府工作人员出现了原因不明的症状。

这名美国政府雇员感到“不易察觉且模糊的，异常的声响和压力”，被诊断大脑受到轻度损伤。随后美国国务院上个月发出医疗警报。

蓬佩奥国务卿说，这是一个严重的健康事件。

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