The United States embassy said on Wednesday it had received a possible threat against U.S. facilities in Japan and urged U.S. citizens to exercise caution. “The U.S. Embassy has learned of a possible threat against American facilities in Japan, the credibility of which has yet to be determined,” the U.S. embassy in Tokyo said in a statement. “Given the upcoming Memorial Day holiday, we advise American citizens to exercise caution and report any suspicious activities to authorities.” Full Story