The explosives used at the Boston Marathon were pressure cooker bombs. These were not particularly well built bombs. These bombs were first used in Afghanistan.
The pressure cookers were filled with BB pellets and ball bearings and placed in black backpacks.
Happening Now reported:
Pressure cooker bombs were first used in Afghanistan.
This pressure cooker bomb was discovered at a Taliban bomb factory in 2010.
UPDATE: Isn’t it time for Democrats to ban all pressure cookers?
UPDATE: Terrorists in camps purportedly operating along the Baluchistan border between Pakistan and Afghanistan are being trained in making and exploding pressure cooker bombs.