From the NYTimes:
The two suspects in the Boston Marathon bombings led police on a wild and deadly chase through the suburbs here early Friday morning that ended in the death of one of the suspects as well as a campus police officer; the other suspect remained at large while hundreds of police officers conduct a manhunt through Watertown, about five miles west of downtown Boston. The surviving suspect was identified as Dzhokhar A. Tsarnaev, 19, of Cambridge, Mass., a law enforcement official said. The suspect who was killed was identified as his brother, Tamerlan Tsarnaev, 26, the law enforcement official said. Investigators believe that both of the suspects were Chechens.