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.