The dead Boston Marathon bombing suspect has been identified as Tamerlan Tsarnaev, 26, and the one still being sought is his younger brother, Dzhokhar Tsarnaev, 19, several sources said Friday.
The older Tsarnaev died overnight in an exchange of gunfire with police.
Much of Boston is on lockdown as authorities search door to door for Dzhokhar Tsarnaev.
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