Key events in the monitoring of Tamerlan Tsarnaev

The House Committee on Homeland Security report identifies a lack of coordination between agencies and multiple failures to identify warning signs about Tamerlan Tsarnaev. Some examples:

Early 2011 FBI receives letter from Russian intelligence officials expressing concern that Tsarnaev had become radicalized.

Early 2011 FBI Joint Terrorism Task Force in Boston initiates assessment of Tsarnaev.


March 22, 2011 FBI case agent enters Tsarnaev on a government TECS database to alert officials to scrutinize any international travel.

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June 24, 2011 FBI closes assessment case on Tsarnaev, finding no links to terrorism.

Summer 2011 FBI notifies Russian authorities it has found no terrorism link to Tsarnaev.

Late September 2011 Unredacted portions of the House committee report do not say so, but Russians sent a letter expressing concerns about Tsarnaev to the CIA.

Oct. 20, 2011 A second TECS database alert is entered into the system, but his name is misspelled as “Tsarnayev’’ and it indicates the wrong birthday. Advisory says “detain is mandatory’’ for screening if Tsarnaev is detected departing or arriving on international travel.


Nov. 6, 2011 Tsarnaev purchases ticket to fly to Russia via JFK airport.

Jan. 18, 2012 TECS database alert system notifies a Customs and Border Patrol officer at Boston Joint Terrorism Task Force of his pending flight. It is unclear if this officer notifies other officials in task force.

Jan. 22, 2012 Tsarnaev departs for Russia. Customs does not detain and interview him, despite the “unequivocal’’ instructions in the TECS database that he be screened.

June 22, 2012 Tsarnaev books travel to depart Russia, bound for United States, triggering another TECS database alert to the Joint Terrorism Task Force in Boston. It is unknown if information is shared within the task force.

July 17, 2012 Tsarnaev departs Russia for the United States but once again is not detained and interviewed by officials.


April 15, 2013 Two bombs explode at the finish line of the Boston Marathon.

SOURCE: House committee report