CENTENNIAL, Colo. ? Threatening letters containing an unidentified white powder were sent to John McCain campaign offices in Colorado and New Hampshire on Thursday, officials said.
No injuries were immediately reported.
At least 19 people were examined at hospitals or were quarantined outside the office in Centennial, Colo., a Denver suburb. The office was evacuated, and authorities were trying to determine whether the powder was hazardous.
http://news.yahoo.com/story//ap/2008..._office_threat