Centennial, Colo. (AP) Authorities say the powder contained in a threatening letter sent to John McCain's campaign office in a Denver suburb was not hazardous.
A second letter sent to a McCain campaign office in New Hampshire initially was reported to contain threatening language and white powder. Authorities later said that was a false alarm and there was no powder in that envelope.
Colorado officials say the inmate suspected of sending the letters from a detention center may face federal felony charges for Thursday's incident.
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