Poppy quarter led to spy coin warnings

The surprise explanation behind the U.S. government's sensational but false warnings about mysterious Canadian spy coins is the harmless poppy quarter, the world's first colourized coin.

The odd-looking coins were so unfamiliar to suspicious U.S. army contractors travelling in Canada that they filed confidential espionage accounts about them.

The worried contractors described the coins as "anomalous" and "filled with something manmade that looked like nanotechnology," said once-classified U.S. government reports and e-mails.

The 25-cent piece features the red image of a poppy inlaid over a maple leaf. The quarter is identical to the coins pictured and described as suspicious in the contractors' accounts.