De to Boston-terroristene skal være tsjetsjenske brødre, melder NBC.
The missing suspect has been identified by the Associated Press as 19-year-old Dzhokhar A Tsarnaev from Cambridge. NBC News is reporting that the dead suspect was his 20-year-old brother.
Both are reportedly from a Russian region near Chechnya and have been living in the US for at least a year.
Dzhokhar Tsarnaev appears to been educated at at a Cambridge high school before receiving a scholarship to pursue higher education in 2011. His name appears on a list of 45 recipients of the Cambridge City Scholarship, handed to students from Cambridge Rindge and Latin School.
Boston police commissioner Ed Davis confirmed that a man is still at large in Watertown, a town about 6 miles north-west of Boston. Swat teams could be seen approaching houses in Watertown as the sun rose this morning as they conducted a house-to-house search across a 20-block perimeter.