The funny thing is the pressuer cooker bomb does not have to be a pressure cooker.
Any pan with a lid the can be screwed down with a Dewalt drill and screws can be made into a bomb! Any old paint pot like we used to use can be made into a bomb!
You can make a bomb with out explosives that can rip your heart out!
The fact is the item is not the perprtrator of terror, the human deploying the item is, be it gun, knife, bomb, or a peice of glass! All can kill but not with out the perp .
Easier still is good oldfashioned threaded galvanized steel pipe. Large diameter plastic pipe coated with shrapnel also would work nicely and make a good boom.