The FBI has released images and video footage of two men suspected of being involved in the Boston Marathon bombs.
The footage shows the men carrying backpacks on a crowded footpath near the finish line.
Three people were killed and over 170 injured in the blasts on Monday.
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Speaking at a news conference, FBI Special Agent in Charge in Boston, Richard DesLauriers warned that the men are considered "armed and dangerous".
He identified suspect No. 1 as a man wearing a dark baseball cap and sunglasses, whilst Suspect No. 2 wore a white cap baseball cap backwards and was seen setting down his backpack on the ground.
The video was taken about 13 minutes before the two explosions.
