Witnesses hear explosions and gunfire in Watertown
Witnesses have described hearing explosions and gunfire in a town outside Boston following the fatal shooting of a police officer at the Massachusetts Institute of Technology (MIT) in Cambridge.
One man in Watertown described seeing, "unmarked cars, marked police cars... I could tell they were serious because he drew a pistol at me and said 'Go back, go home'".
The operation has been linked to the Boston Marathon bombings.
19 Apr 2013
- From the section US & Canada