very soon. >> because how long would it take somebody to string together whether these bombs were made by the same bomb maker or track back perhaps the specific materials used to make these bombs? >> it's tough to say because as we used to say all the time, an explosive device is up to the imagination of the bomber. it's also up to the situation that the bomber is in during the time he's preparing. and they're also always probably signature items that anyone with a skill set might use more often than others. it's hard to speculate about that. so the time that it takes to put one of these operations together, you wouldn't tend to think it's short, but it's just difficult to understand the specific situation that the bomber was in and his intentions