UPDATE: A government official said a letter sent to the office of the presumptive Republican presidential nominee near Denver contained powder, but was being treated as a hoax and was believed to have been sent by an inmate at a nearby jail in Arapahoe County.
The letter sent to the office in New Hampshire did not contain powder, but rose suspicions of staffers who were jittery after the Denver area office received its letter.
Secret Service spokesman Eric Zahren said the two letters are unrelated.
Despite the likelihood of a hoax, staffers at all the Arizona Republican’s campaign offices nationwide were told not to open letters.
“Let’s be cautious and not open mail tomorrow unless we clearly know the source,” according to a campaign e-mail that was sent to staff members and obtained by The Washington Times. “Let’s see what comes of this.”
John McCain’s Denver campaign office received an envelope containing white powder and a threatening note Thursday afternoon.
Spokesman Jeff Sadosky stated the office has been evacuated, and that federal and local law enforcement have been notified.
He would only say, “It was a threatening note and that the staff on site will be seen by health care professionals immediately, and the incident is under investigation.
“We are taking all necessary precautions,” Sadosky said.
The letter was opened at about 5 p.m. ET.