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The FBI says  the two bombs that exploded Monday at the Boston Marathon           were carried in a dark-colored bag, and

         possibly consisted of pressure cookers

                       packed with nails and ball bearings.
FBI examiners are looking at fragments recovered from the scene, as they try to piece together how the attack happened.
Authorities do not have any suspects, and

                      are asking the public to send in any photos or videos taken along the marathon route to help find who was responsible.