Boston Marathon Explosions

There were conflicting reports Wednesday that a suspect was arrested in the Boston Marathon bombing. The Boston Police Department now saying that no arrest has been made.

FOX News Radio's Jeff Monsosso reports from Boston:

FOX News has confirmed that federal investigators have released an image that shows what they describe as a young man carrying and dropping a black backpack at the scene of the second bomb blast.

Boston Marathon Bomb Photos

The backpack - very similar to the one we've seen shredded to pieces following the blast. We're told the image was taken from a nearby Lord and Taylor store. One of the reasons police have said all along that anybody that's taken images or video that day they need to turn them in. 

FBI released this statement following the conflicting reports:

"Contrary to widespread reporting, there have been no arrests made in connection with the Boston Marathon attack. Over the past day and a half, there have been a number of press reports based on information from unofficial sources that has been inaccurate. Since these stories often have unintended consequences, we ask the media, particularly at this early stage of the investigation, to exercise caution and attempt to verify information through appropriate official channels before reporting."

Boston Marathon Explosions

The search for those responsible for the Boston Marathon bombing continues. Investigators have recovered a piece of circuit board that they believe was part of one of the explosive devices, as well as part of a pressure cooker.

FOX News Radio's Courtney Kealy reports from Boston:

Lab specialists from Quantico, Virginia still methodically gathering detritus from the explosives on the scene, which will be used to piece together the explosive device.

Boston Marathon Bomb Photos

The FBI released a photo of a mangled pressure cooker, used as part of the bomb. FBI special agent Richard DesLauriers saying it's a painstaking task.

(DesLauriers) "We are doing this methodically, carefully, yet with a sense of urgency."

Law enforcement officials are urging the public to continue contributing photos and videos and information.

Boston Marathon Explosions

Many more streets have been opened up, but security remains intense with police and National Guardsmen on patrol.

In Boston, Massachusetts, Courtney Kealy, FOX News Radio.

Boston Marathon Explosions

Investigators say an item common in many kitchens, a pressure cooker, was used to create the bombs that caused so much death and destruction at the Boston Marathon.

FOX News Radio White House Correspondent Mike Majchrowitz reports it's a common technique seen in many terrorist attacks:

Investigators say the bombs were made using kitchen pressure cookers as a container. It's a design found in many overseas improvised explosive devices and was employed in the unsuccessful 2010 Times Square attack. Retired Colonel Bob Morris, head of the Global Campaign against IEDs, says the pressure cooker increases the blast force.

(Morris) "The longer you can contain the explosion... the larger the concussion will come of it."

And Morris says the container itself creates deadly projectiles.

(Morris) "When that goes off, it generates from the material that it's being held in and a significant amount of shrapnel."

Morris says information on how to build a pressure cooker bomb is widely available on the internet.

At the White House, Mike Majchrowitz, FOX News Radio.

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