A law enforcement intelligence bulletin obtained by the AP identified the surviving bomb suspect as Dzhokhar A. Tsarnaev, 19, of Cambridge, Mass.
Two law enforcement officials told AP that Tsarnaev and the other suspect who was not immediately identified have been living legally in the U.S. for at least one year.
Russia's North Caucasus region has been plagued by an Islamic insurgency stemming from separatist wars in Chechnya.

The two suspect in the Boston Marathon bombing are shown In this FBI photo from Associated Press. Police are looking for the man in the white cap; the other man was killed in a shootout with authorities.
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