Over 30 letters with suspicious white powder have been mailed to banks in eight U.S. cities, but preliminary tests found them harmless, authorities said on Tuesday.
"These threat letters contain a powder substance," the FBI said in a statement. "At this point, field tests on the powder have been negative. Additional testing will be completed. Even sending a hoax letter is a serious crime."
According to FBI officials, a series of letters were sent to Chase bank branches in or near Chicago, Cincinnati, Dallas, Denver, Newark, New York, Oklahoma City and Washington, all appearing from the same source at South Texas.
Agencies including U.S. Postal Service also joined in the investigation. So far, there has been no related injuries reported.
However, neither the local Postal Service nor the FBI released the letters' content or their origin since the investigation is still undergoing.
Source:Xinhua
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