For example, in October 2011, the FBI added Tamerlan Tsarnaev's name to the TSDB, before Tsarnaev committed the Boston Marathon bombings in April 2013.
To provide an example, in October 2011, the FBI added Tamerlan Tsarnaev's name to the database used for identifying and tracking terrorists, before he was responsible for the Boston Marathon bombings in April 2013.