Officials of the Federal Bureau of Investigation (FBI) are still looking for evidence that could lead them to the responsible author or multiple authors of the bomb attack that left three dead and more than 141 injured in the finish line of the Boston Marathon, which commemorated its 117th edition.
The FBI is in charge of several federal, state and local agencies that are currently collaborating on the investigations. So far, there have been no arrests and no suspects, the only certainty is that the terrorist attack was coordinated and planned.
In total, two bombs exploded hour and a half after the first runners crossed the finish line. It is known that other two bombs did not exploded.
A senior member of the research team who preferred anonymity explained that the bombs, homemade, consisted of gunpowder and were filled with ball bearings, nails and shrapnel.
When the deadly combination explodes, it shoots out shrapnel that generally impacts at the height of the extremities. That is the reason why hospital official sources have reported numerous amputations and severe injuries due to shrapnel wounds.
Taliban denies involvement
Ihsanullah Ihsan, Pakistani Taliban spokesman, said that wherever they find an American, they will kill them, but denied any involvement in the Boston bombing.