(CNN) - Federal and local officials are on the scene of a threatening letter with white powder received at John McCain’s regional campaign office outside Denver, in suburban Englewood, Colorado.
At 3 p.m. MT, a staffer in the McCain Denver office opened a letter containing a threatening letter and a quantity of white powder," McCain Spokesman Jeff Sadosky told CNN's Justine Redman. "Staff immediately contacted local and federal law enforcement. Staff are taking all necessary precautions, including checking in with medical professionals"
“Agents and Officers are responding," United States Secret Service Spokesman Malcolm Wiley who is in Denver also tells CNN's Jim Spellman.