Report: Boston Bombs May Have Been Pressure Packed


By News Department

Boston, MA (ABC News)--Law enforcement and Congressional sources told ABC News today there is a leading theory that at least one of the bombs that exploded during the Boston Marathon Monday may have been packed into a pressure cooker, a tactic found in rudimentary bomb-making instructions widely available online.

"The reporting I've received thus far indicates it is that style of explosive device," Rep. Michael McCaul (R-Texas), the House Homeland Security Committee Chairman, told ABC News. "That is important for tracing the origins because while it can be made homegrown and can possibly have been, it is the preferred weapon of choice by terrorists in Afghanistan and Pakistan."

McCaul's comments came hours after President Obama said in a press conference authorities do not know who was behind the deadly attack. No group, domestic or foreign, has claimed responsibility.

Earlier today doctors caring for the 170-plus victims of the deadly bombing reported they have been pulling nails or nail-like objects from those struck by the twin explosions – likely shrapnel from inside the bombs.

"Nails or sharp objects," Dr. George Velmahos, chief of trauma at Massachusetts General Hospital, said at a press conference today. "Can't say for certainty, but that's what they look like. [They're] numerous… 10, 20, 30, 40 in their bodies, maybe more."

A spokesperson for Brigham and Women's Hospital, another medical center caring for the wounded, reported similar injuries, apparently caused by carpenter nails and small ball bearings.

Velmahos said he believes that shrapnel specifically came from the bomb itself, which, based on the number of lower extremity injuries, was likely planted low to the ground. Others were hurt by environmental shrapnel -- objects close to the blast -- and still more were injured just by the blast of air that slammed them against walls.

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