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April 17, 2013 (Boston)—The FBI laboratory has analyzed pieces of  black nylon recovered from the finish line at the Boston Marathon and has determined that both explosives were placed in a dark-colored nylon bag or backpack.  

“The bag would have been heavy because of the components in it,” said Richard DesLauriers, special agent in charge of the Boston division of the FBI. The FBI, in conjunction with other agencies, is scouring databases andinterviewing eyewitnesses after securing the downtown area.  More than 2,000 tips have been received on the bombings, which killed three people and injured 176 on Monday.

“Importantly, the person who did this is someone’s friend, neighbor, coworker, or relative. We are asking anyone who may have heard someone speak about the marathon or the date of April 15 in any way that indicated he or she may target the event to call us. Someone knows who did this,” Agent DesLauriers stated in a press release sent to media nationwide.

Cooperation from the community will play a crucial role in this investigation, he added, asking the public remain to alert and to alert the FBI to the following activity:

  • An individual who expressed a desire to target the marathon;
  • Suspicious interest in researching how to create explosive device;
  • The noise of explosions in remote areas prior to yesterday which may have been used as tests by those responsible;
  • Someone who appeared to be carrying an unusually heavy, dark-colored bag yesterday around the time of the blasts and in the vicinity of the blasts.

At this time, there are no claims of responsibility for the bombings, he added.

“We will continue to work around the clock, tirelessly, side by side with our partners to continue to investigate and act on these leads,” the FBI source indicated.

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