Washington (CNN) - U.S. intelligence and law enforcement agencies are again reviewing all intelligence on the two suspects in the Boston Marathon bombing for clues about their motivations and connections to possible terrorist groups, U.S. officials told CNN.

In the hours since the identities of Dzhokhar Tsarnaev and Tamerian Tsarnaev were confirmed by the FBI, “there is a very methodical and in-depth analysis under way on these suspects and the connections they may have had to any overseas group,” a senior U.S. official said.