The letter has been turned over to the FBI's Joint Terrorism Task Force for testing and investigation.
The Russian request was forwarded to the Joint Terrorism Task Force in Boston.
The Federal Bureau of Investigation's Joint Terrorism Task Force and the NYPD's intelligence division, which is responsible for the mayor's protection, are investigating the threats.
The FBI National Joint Terrorism Task force will be discussed as well as the flow of threat information and how information is investigated, evaluated, and disseminated.
An employee of the Defense Department's Criminal Investigative Services, assigned to the Joint Terrorism Task Force, ultimately decided to drop the investigation after reviewing the intercepted communications and Hasan's personnel files.
The head of the Boston FBI office, Richard DesLauriers, said the agency's joint terrorism task force would take the lead on the investigation, and federal agents were already traveling to the area.
An employee of the Defense Department's Criminal Investigative Services, assigned to the Joint Terrorism Task Force, ultimately made the decision to drop the investigation after reviewing the intercepted communications and Hasan's personnel files.
"This information was put in a database, it was shared among different agencies, it was shared with a joint terrorism task force, and that's exactly what should happen, " U.S. Rep. Adam Schiff, D-California, told CNN.
In addition to speaking to agents from the Joint Terrorism Task Force in the hospital January 7, Medunjanin was interviewed later that day at the FBI offices in New York, the federal prosecutors said in their letter.
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As I've said in my recent visits to the National Counterterrorism Center and the Joint Terrorism Task Force, we are extraordinarily grateful to them for the hard work, without any fanfare, that they do to keep the American people safe.
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Don Borelli, a Senior Vice-President of The Soufan Group, a strategic consultancy, is a 25-year veteran of the Federal Bureau of Investigation, where he was assistant special agent in charge in the New York Joint Terrorism Task Force, responsible for international terrorism.
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Kuby said his client had been an occasional source for New York's Joint Terrorism Task Force when it looked into previous terror plots, and a detective who had sought out Afzali as a source in previous cases would testify on the imam's behalf Thursday.
After the hearing, the head of the FBI's Boston office, Richard DesLauriers, issued a statement describing the FBI and Boston police department's work together on a joint-terrorism task force, where police detectives had access to a database with the details of the FBI's inquiry into Mr. Tsarnaev.
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