The scene near the end of the Boston Marathon finish line Monday.
Eileen Sullivan of the Associated Press
reports:
A person briefed on the Boston Marathon investigation says the explosives were in 6-liter pressure cookers and placed in black duffel bags.
The person says the explosives were placed on the ground and contained shards of metal, nails and ball bearings. The person spoke on the condition of anonymity because the investigation was ongoing.
Pressure-cooker bombs
are not new to terrorists and are simple to make. Pressure-cooker bombs were said to have been used in the
Hyderabad bombings in India in February this year. Those bombs killed 17 people and injured at least 119.