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BOSTON, Massachusetts (AP) -- The number of governor's offices receiving suspicious letters grew to at least eight Friday, the day after one that had been rigged to ignite when opened prompted evacuations at the Montana Capitol.
In Boston, Gov. Mitt Romney's office received a letter bearing a return address from the same maximum-security prison in Nevada that was the apparent source of the other letters.
The governor's office, which had been alerted by the U.S. Department of Homeland Security, did not open the letter.
www.cnn.com...
They were rigged with matches set to ignite when the letters were opened.
Originally posted by muppet
At a guess.. a stiff A4(letter) sized envelope, with a match stuck on the documents inside, and sandpaper glued to the inside of the envelope.. so when the documents are pulled out the match ignites on the sand paper..