Shots fired as police seek US bomb suspect

WATERTOWN: A round of blasts has been heard in a Massachusetts town amid the search for the surviving suspect in the Boston Marathon bombings.

Emergency and military vehicles sped through town after an earlier burst of gunfire. State police spokesman David Procopio says the ``renewed activity in Watertown'' is connected to the search for 19-year-old college student Dzhokhar Tsarnaev.

Authorities are telling residents of the area to stay indoors. The burst of activity came less than an hour after police announced that they were scaling back the hunt because they had come up empty-handed following an all-day search.The manhunt paralyzed the metropolitan area.