>> reporter: imagine if this blew up in times square. what you're watching is the result of 300 pounds of explosive grade fertilizer. because the times square suv had nonexplosive grade fertilizer this is more intense than what could have happened in new york, according to the experts here who conducted the xmoegs as part of a training course for first responders. knowing what you know was in the vehicle, what type of damage would that have done? >> it was a very amateur device. the debt nation, if it could have gotten something to detonate would have been low order and would have spread stuff all over the street and it had a lot of fuel. we would have had a small explosion, it would have been a big fire. >> reporter: the federal government has trained 300 first responders through this explosives training. they see firsthand what the