Boston transit was shut down Friday as the manhunt for the Boston Marathon bombing continued.
Residents in the western Boston suburbs of Watertown, Allston-Brighton, Cambridge, Belmont and Newton have been asked to stay indoors and not use transit.
One of the suspects was already shot and killed by police after a shootout.
The other suspect, known as "white hat," is still at large after escaping police.
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Boston police were now combing the suburb of Watertown just west of the city for suspects.
Vehicle traffic has been prohibited in the area.
Two males were said to be handcuffed in the back of a taxi, according to reports on the Boston police scanner, but details remain vague.
The Associated Press reported that Boston police said the suriving suspect's name is Dzhokhar A. Tsarnaev, 19, of Cambridge, Mass.