updated 3/16/2009 6:38:26 PM ET 2009-03-16T22:38:26

Federal prosecutors in Texas say a New Mexico man has pleaded guilty to mailing threatening letters containing suspicious powder to dozens of banks and federal offices across the country.

Prosecutors in Amarillo say Richard Leon Goyette pleaded guilty Monday to one count of issuing threats and false information and one count of making threats and hoaxes. Other counts against him were dropped.

Prosecutors say the 47-year-old Goyette mailed letters from Amarillo to 52 offices and banks in 11 states and the District of Columbia in October.

No one was injured and the powder was found to be calcium carbonate, a component of chalk.

Goyette faces up to 15 years in prison and a $500,000 fine.

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