Image of operation in Watertown
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Watertown resident films gunfire as police hunt marathon suspect

19 April 2013 Last updated at 11:39 BST

A resident of Watertown near Boston has filmed the gunfire and explosions heard while police chased the marathon bomb suspects.

Police began the manhunt on Thursday after an officer was killed at a university campus.

Two suspects threw bombs and traded gunfire with police chasing them.

This is how CBS reported on the footage.