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US authorities charge man in ricin probe

Members of US Secret Service Uniformed Division secure an area in front of White House in Washington, DC, on April 17, 2013 as a part of tightened security. US authorities have arrested a man as part of a probe into poison-laced letters sent to President A 41-year-old martial arts instructor was charged with sending ricin-laced letters to President Barack Obama and other public officials following his arrest Saturday.