FBI: Boston Marathon Bombs Made From Pressure Cookers
The FBI has revealed that one of the Boston Marathon bombs appears to have been made from a pressure cooker containing nails and ball bearings, NBC News reports.
Investigators have found fragments of dark nylon, possibly from a backpack containing the bombs, as well as pieces of what they believe was a pressure cooker used to make the bomb. Typically, a pressure cooker is used to speed cooking by creating a tight seal which builds pressure inside the pot. A pressure-cooker bomb was used in the 2010 attempted Times Square attack, as well as in Mumbai, India, in 2006.