1.   Another option, the department says, is to mix the plutonium with highly radioactive waste and embed both in steel canisters filled with glass.

2.   But the devices bore a striking resemblance to the others, made from blue gas canisters filled with nails and bolts.

3.   If fleeing an enemy, the driver could use a mechanism that creates an oil slick behind the vehicle or a canister filled with shrapnel.

4.   On Friday, a cooking gas canister filled with explosives, screws and bolts exploded near a metro station in southern Paris on Friday.