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.