While there are just as many questions as answers on the day after the attack at the Boston Marathon, there are a few details that have come to light, including the bomb materials.
While there are just as many questions as answers on the day after the attack at the Boston Marathon, there are a few details that have come to light.
Yesterday, there were reports of bombs that did not go off found around the scene. Today those reports have been disavowed, and it is now believed that the only bombs on the premises were the two that went off. Also, as reported yesterday, the incident at JFK library was not a bomb or any kind of attack, just a coincidental fire.
As for the bombs themselves, we have a few details. It seems that they were "improvised explosive devices," (IEDs) meaning that they were made with household items, and are harder to trace. Bomb makers tend to have certain signature methods which can be detected, but these bombs don't appear to have anything like that, at least nothing known.
The bombs were made from pressure cookers, filled with hard, household items like ball bearings, shards of metal and nails. These were hidden in black duffel bags and placed in trash cans near the finish line of the Boston Marathon. It is not yet known how the bombs were set off, but it seems likely that the detonation was controlled remotely, given that the bombs went off only ten seconds apart.
Also not known is who did this and why. What is it a group or individual? Is it significant that the attack happened on tax day? And/or Patriot's Day? Or even the Boston Marathon itself. The NPR Counter-terrorism correspondent Dina Temple-Raston speculated that the evidence might lean more toward a domestic terrorist, but that's no more than speculation.
We will continue to update this story as new information comes to light.