FBI has released photos and video of the 2 suspects. Public help has been sought in identifying the men. The images are from surveillance cameras near the explosion sites shortly before Monday's blasts. Within moments of the images being released the FBI's website crashed. In the surveillance footage, the men are seen walking together in the crowd, and one of them - in a white cap - is seen setting down a backpack at one site near the finish line. FBI warned that the 2 suspects could be armed and extremely dangerous. Monday's bombings killed three, including a student from China, and injured more than 180.
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