TEXARKANA (CBSDFW.COM/AP) — A federal grand jury has indicted an East Texas woman who authorities say sent ricin-laced letters to President Barack Obama and others in an attempt to frame her estranged husband.

Prosecutors announced Friday that 35-year-old Shannon Richardson is named in a three-count indictment. Richardson is accused of sending threatening letters in May to Obama, New York Mayor Michael Bloomberg and the head of the mayor’s gun-control group.

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Richardson, of New Boston was arrested June 7. If convicted, Shannon Richardson faces a maximum penalty of five years in prison and a $250,000 fine on each of the charges.

Richardson’s court-appointed attorney, Tonda Curry, was not immediately available for comment Friday.

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The government alleges she mailed the letters to pin the crime on Nathan Richardson, the man she married in 2011. He filed for divorce earlier this month.

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