The US Embassy announced on Wednesday that it had received a possible threat against US facilities in Japan and warned American citizens to be on guard against suspicious activities.
The embassy, which remained open for business on Wednesday, did not say how or when the threat had been received. Officials refused to detail actions taken.
"The US Embassy has learned of a possible threat against American facilities in Japan, the credibility of which has yet to be determined," the warning sent to US citizens via e-mail read.
"Given the upcoming Memorial Day holiday, we advise American citizens to exercise caution and report any suspicious activities to authorities," the note added.
US Embassy official Doug Morris said he could not add to the warning, and that the Embassy would determine whether to take further action as it investigated the credibility of the threat.
Major Richelle Dowdell, spokesman for US Forces Japan, said she had not heard about the threat, and that security levels at the USFJ headquarters had not been affected. Some 50,000 American troops are based in Japan.
The Tokyo Metropolitan police department has received no reports about any threats, damages or incidents at US-related facilities in Japan, a police spokesman said.
{{/usCountry}}The Tokyo Metropolitan police department has received no reports about any threats, damages or incidents at US-related facilities in Japan, a police spokesman said.
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