Washington, April 17: Two bombs that killed three people and injured 176 at the Boston Marathon finish line Monday were pressure cookers filled with metal and ball bearings, according to various media reports.
The New York Times cited Republican Michael McCaul, who heads the House Homeland Security Committee, as saying authorities believe the explosive may have been a "pressure-cooker device", similar to improvised explosive weapons that have been used against American troops in Iraq and Afghanistan.
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