"Oh, that's quite simple. You could use nails or ball barrings to make a bomb more destructive. Things like that literally rip things apart in the explosion." He points out. "It's easier in a pipe bomb to cause that kind of damage. You just need the right starting mechanism whether it's a mercury weight or a timing device."

Each had its advantages and disadvantages, and Wylan would need to take time to figure out the best way to make the bombs that they'd end up using.

"There's plenty of ways to make a bomb more destructive, it just depends on the kind of destruction you want. If you're looking to cause more injury on a wide scale, shrapnel is the best way to go."