First crime scene photos of fatal Boston bomb emerge - FOX 32 News Chicago

First crime scene photos of fatal Boston bomb emerge

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Credit: WAGA Credit: WAGA
Credit: WAGA Credit: WAGA
Credit: WAGA Credit: WAGA
Credit: WAGA Credit: WAGA
Credit: WAGA Credit: WAGA
CHICAGO (FOX 32 News) -

Chilling pictures of the home-made bombs believed responsible for the Boston attack and the duffel bag one of the bombs may have been placed in, were obtained exclusively by our sister FOX station in Atlanta.

They appear to be crime scene photos taken as part of the investigation and seem to prove beyond doubt that the terror in Boston was triggered by a simple low-cost appliance found in many American kitchens.

SEE: Boston Marathon bombing kills 3, injures over 140

The FBI now confirms the bombs were apparently made using pressure cookers and pictures obtained by FOX 5 in Atlanta show the power of that first explosion.

One photo shows a twisted chunk of stainless steel metal lies on the sidewalk. In another, you can see the underwriter's laboratory number on the bottom of the six-liter pressure cooker.

Another picture shows the imprint "gas and electric." Nearby, the remnants of a black, padded backpack or duffel bag, similar to the ones police say were used to disguise the bombs.

Throughout the day, teams of investigators searched a 12-square block section of Boston for more evidence.

SEE: Chicago police say no local threats after Boston

"Among items partially recovered are pieces of nylon, which could be from a black backpack, and what appear to be fragments of BB's and nails possibly contained in a pressure cooker device," the FBI said.

Improvised explosive devices using pressure cookers have been used for some time in attacks overseas. Homeland security warned about the potential use of the homemade bombs in a memo issued in 2004. In 2010, an online Al Qaeda magazine gave specific instruction on how to build the bombs, in an effort to encourage extremists in the United States.

The bombs are typically filled with nails and small chunks of metal to maximize injuries.

"Many of them have severe wounds," a doctor explained of the injuries. "Mostly in the lower parts of their bodies, wounds related to the blast effect of the bomb as well as small metallic fragments."

SEE: Marathon Bombing: How you can help

New video continues to surface of the explosions, including one taken by a runner nearing the finish line.

The FBI is asking for the public's help. They're requesting pictures taken near the crime scene that could help identify the person or persons who placed the bombs. So far, they've received more than 2,000 tips.

"This was a heinous and cowardly act, and given what we now know took place," President Obama said Tuesday. "The FBI is investigating it as an act of terrorism."

Another picture of what could be one of the bombs before it exploded was shown on-air by a Boston TV station, WHDH.

The picture taken just before the blast shows what appears to be a shopping bag in front of a metal fence holding back spectators. The second picture shows the bag is gone, and people nearby are severely injured.

The station has turned the photos over to the FBI.

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