Federal Bureau Of Investigation

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Valerie Parlave of the FBI's Washington field office — flanked by Rod J. Rosenstein, U.S. attorney for Maryland (left) and Ronald Machen Jr., U.S. attorney for the District — speaks about the return to the U.S. of Mr. Toth, a former teacher at the Beauvoir school who fled the U.S. in 2008,

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Ronald Hosko, of the FBI's Criminal Investigative Division (left), and Vince Cohen Jr., assistant U.S. attorney for the District, congratulate each other after Tuesday's news conference announcing the apprehension of Eric Justin Toth, who was among the FBI's Ten Most Wanted Fugitives as a suspect in a child pornography investigation.

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** FILE ** FBI agents walk along Norfolk Street in Cambridge, Mass., on April 19, 2013. (Associated Press)

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Dzhokhar A. Tsarnaev (FBI)

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** FILE ** Agents of the FBI and Bureau of Alcohol, Tobacco, Firearms and Explosives check suspect Dzhokhar Tsarnaev for explosives and give him medical attention after his capture in Watertown,

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An FBI agent goes door-to-door evacuating residents of Norfolk Street as investigators search for a suspect in the Boston Marathon bombings, in Cambridge, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Michael Dwyer)