The two terrorists whose bombs killed three and wounded more than 170 people Monday at the Boston Marathon have been identified as recent immigrants from the war-torn Russian province of Chechnya. One was slain in a gun battle with police near Watertown, Mass., while another is reportedly still at large and considered armed and dangerous. The Associated Press reported early Friday:

Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.
The suspects were identified to The Associated Press as coming from the Russian region near Chechnya, which has been plagued by an Islamic insurgency stemming from separatist wars. A law enforcement intelligence bulletin obtained by the AP identified the surviving bomb suspect as Dzhokhar A. Tsarnaev, a 19-year-old who had been living in Cambridge, Mass.
Two law enforcement officials told the AP that Tsarnaev and the other suspect, who was not immediately identified, had been living legally in the U.S. for at least one year.

UPDATE: It is being reported by Fox News and other organizations that the dead suspect is believed to have been the older brother of the suspect still at large: