The American Spectator

"At approximately 3pm Mountain time, a McCain staff member in Denver opened an envelope that contained a threatening letter and an unknown white powder. As a precautionary measure, the campaign office was immediately closed and staff was sent to a local hospital for medical evaluation. Local authorities as well as the FBI and United States Secret Service have investigated the scene and determined that the substance poses no threat.

"Also yesterday afternoon, a similar letter was found in the campaign's Manchester, New Hampshire office. After closing that office, the Manchester Police Department determined that there was no threat.

"Senator and Mrs. McCain thank the local and federal authorities for their swift response and will continue to monitor the situation closely."