article_snippet: their bombs were described as powerful pressure-cooker explosives controlled remotely.
article_snippet: There were fuses from Christmas lights and detonators constructed from model car parts.
article_snippet: Two years after the attack Michael Marks, a former special agent for the Naval Criminal Investigative Service, agrees on the technical aspects of their bombs.
article_snippet: These were two relatively sophisticated devices that went off almost simultaneously.
article_snippet: It would be my opinion that These had somebody who was more of a skilled bomb maker, an engineer if you will, assist These in saying these are the steps you need to go through and then assemble the device to make the device safely and to make the device function the way These want.
article_snippet: These were the kind of bombs that need testing to make sure These work the way you expect.
article_snippet: Now it could be luck that they put this thing together, put this thing at the Boston Marathon finish line, and were able to detonate they so close to each other and sequentially.
article_snippet: That suggested the other was being kept to use with other bombs.
highlights_snippet: : I think "they had somebody who was more of a skilled bomb maker .. assist they"
  