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ALL CLEAR: Letter with white powder found at federal building

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OKLAHOMA CITY - HazMat has given the "all clear" after a letter was found with white powder at the federal building downtown Monday.

Officials have not confirmed who may have sent this letter.

They said a worker opened a package in the mail room and found a letter inside containing the white powder.

Last week three letters were found at Oklahoma government buildings all with a white powder inside.

Authorities determined an inmate sent those letters and the substances were not a threat.