Officials: Threat, powder sent to McCain's Colorado office

CENTENNIAL, Colorado — Authorities say a threatening letter containing an unidentified white powder was sent to a John McCain campaign office in the Denver suburb of Centennial, and a hazardous materials team was trying to determine if it is harmful.

Andy Lyon of Parker South Metro Fire Rescue Authority says a worker at the office opened the letter and discovered the powder Thursday afternoon.

Lyon says no injuries have been reported but some people may have gone to hospitals on their own.

Postal Inspector Jo Jan Henderson says agents from her office are the scene.

Officials with the FBI, Secret Service, Arapahoe County Sheriff's Department and McCain's Colorado campaign did not immediately return calls.

The threat came four days before the Democratic National Convention opens in Denver.