The so called fertilizer bomb was polymerized Nitrogen, which is in a ball with other ornate material to keep it together in a time release with water. It was filled in barrows of diesel fuel, therefore there wouldn't have been an explosion just a huge fire. Yeah their was DET cord, but still couldn't have caused this explosion. The real bomb went off at the same time was a directional barometric bonb, which lowers the barometric pressure and it is directional. Notice the explosion did not destroy cars away from the van, nor buildings,. The building imploded, windows were taken out in surrounding buildings but not structural damage. Two Barometric pressure bombs were stolen out of a National guard unit in the State of Washington several months earlier. Video of the bombing site found the other pressure bomb, people scattered when that bomb was found. You can't find that video anymore of the second bomb.