Police still clearing cordoned-off areas in Watertown

Massachusetts State Police said tactical units are still clearing cordoned-off areas in the city of Watertown as the search for Boston bombing suspect Dzhokhar Tsarnaev continues:


Tactical units still clearing cordoned-off sectors in Watertown, while investigators continue to hunt bomber who is at large.


Boston bombs 'remote trigger'

US investigators have revealed the two bombs that went off at the Boston Marathon were detonated with the kind of remote control device used for a toy car.