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UPDATE: Wednesday, 10:20 AM EST

The Associated Press is reporting that investigators have recovered a piece of circuit board that they believe was part of one of the explosive devices.

The lid to the pressure cooker, seen below, was catapulted onto the roof of the nearby building.

SOURCE: AP

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UPDATE: 10:30 PM EST

ABC has released a photo that is believed to be the shredded backpack in which the bomb was reportedly hidden.

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UPDATE: 7:10 PM EST

New pictures of what Fox News says are fragments of the pressure cooker and bomb have been released.

Another picture of what might be the bomb:

See the rest here.

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Did investigators just figure out how the deadly Boston bombs were transported to the site of the blasts?

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New black nylon fragments recovered at the crime scene suggest that the bomb was concealed in a black bag or backpack, according to an FBI official leading the probe.

FBI Special Agent in Charge Richard DesLauriers said investigators also had recovered fragments of BBs and nails from the scene of Monday’s back-to-back explosions, which killed three people and wounded more than 170 others. The devices may have been constructed from pressure cookers, he said.

Another video released by WHDH news show visuals of what many believe is a bomb wrapped in a light bag.

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Investigators have yet to identify the item, which was placed in front of the guardrails.

Watch the video here.

SOURCE: Reuters | WHDH