BEIJING-The U.S. State Department on June 8 issued an expanded health alert for all of China amid reports that some U.S. diplomats based in the country had experienced a mysterious malady resembling a brain injury.
State Department spokeswoman Heather Nauert also said at the time that the Chinese government assured the State Department that it is investigating the symptoms felt by the US government employee.
A State Department official said Friday that the two individuals may be new cases, but it has not been "medically confirmed".
The U.S. has sent a medical team to evaluate workers at the U.S. consulate in Guangzhou, China.
The FBI launched an investigation that lasted a year following attacks in Havana, but they were unable to determine what caused the phenomena.
"Symptoms to be attentive for include dizziness, headaches, tinnitus, fatigue, cognitive issues, visual problems, ear complaints and hearing loss, and difficulty sleeping", the alert says.
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Americans are advised to move to another location and refrain from trying to locate and identify the source of the auditory sensation and to seek medical help if they experience similar symptoms. The Foreign Ministry said Thursday the US had not formally raised the matter with Beijing.
Secretary of State Mike Pompeo last week announced that the U.S.in May established a Health Incidents Response Task Force to look into "unexplained health incidents" affecting Americans in Cuba and China.
Twenty-one USA diplomats in Cuba were affected last August by sonic attacks with an acoustic device, according to the State Department.
Washington has said in the past that Cuban authorities must take responsibility for the safety of U.S. diplomats on their soil, but the Havana government denies any knowledge of an attack.
The cases come at a sensitive time in relations between the United States and China, with the two nations locked in negotiations aimed at preventing a trade war and tensions over Beijing's claims to the South China Sea.
Canada in April also ordered families of diplomatic staff in Cuba to return home after mysterious health symptoms were detected in 10 Canadians stationed on the island.
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