nails. also seeing, as you said, parts of what appears to be a circuit board, also a timing device. as well, there is a nylon bag into which this metal container or containers were placed. they believe they probably used a nylon bag, a backpack or some other type of bag in which these were placed then put on the ground to try to do maximum damage. these items that were put inside are providing the deadly shrapnel that was -- that what happened when it blew up that injured so many people and took the lives of at least three. when you look at these things, you see how someone was able to put these devices together. we have some animation to show you as well. this is sort of indicating when they put gunpowder inside with these pieces of shrapnel, and they were ignited. when the gunpowder ignited. the pressure built up inside this container, according to our