Two offices of the US presidential hopeful John McCain were evacuated after a threatening letter containing unidentified white powder arrived at his Colorado regional campaign headquarters.
Authorities say initial tests show it was not hazardous. But officials took no chances.
Andy Lyon, from the South Metro Fire and Rescue Service said: “We have 12 people quarantined here on scene who were exposed; three of those (are) law enforcement, two firefighters and seven civilians. None of them are (sic) showing any symptoms.”
The Republican candidate had come under fire for not knowing exactly how many houses he owns.
McCain was stumped by the question in an interview with Politico newspaper.
His Democrat opponent Barack Obama questioned the lifestyle led by McCain and his wife Cindy.
McCain’s staff eventually identified at least four houses, although media reports found at least seven.
Obama said it showed that McCain was completely out of touch with the economic realities being suffered by most Americans.
And, in a riposte to McCain’s comments on the strength of the US economy, Obama said that it is not surprising someone thinks the economy is “fundamentally strong” when they can’t even remember how many houses they own.