After several days of investigation to Boston's blast which killed 3 and wounded hundreds of people who attended the Marathon event, authorities finally identified the explosives that were being used by the alleged terrorist as it was a IED or Improvised Explosive Device mainly composed of pressure cooker, round metal bearings, shrapnel and detonating device.
The photos below are the actual detonated IED components taken by Reuters after the incident.
The zipper tab which has a Fox racing logo was suspected as part of the suspect's bag.
The suspected terrorist is still at large and remain unidentified as the FBI continue to investigate the attack to find leads.
All photos courtesy of Reuters. Copyrights belong to them.