The CIA pushed to have one of the suspected Boston Marathon bombers placed on a U.S. counterterrorism watch list more than a year before the attacks, U.S. officials said Wednesday.
Russian authorities contacted the CIA in the fall of 2011 and raised concerns that Tamerlan Tsarnaev, who was killed last week in a confrontation with police, was seen as an increasingly radical Islamist who could be planning to travel overseas.
The CIA request led the National Counterterrorism Center to add Tsarnaev's name to a database known as the Terrorist Identities Datamart Environment (TIDE), which is used to feed information to other lists, including the FBI's main terrorist screening database. The CIA's request came months after the FBI had closed a preliminary inquiry into Tsarnaev after getting a similar warning from Russian state security, according to officials who spoke on condition of anonymity because they were not authorized to discuss the matter.