Bob and Doug were up in the hatch. That's when the vehicle hit an improvised explosive device.

Late this morning, two US soldiers were slightly wounded when their vehicle was struck by an improvised explosive device or a hand grenade,

This is just a chemical reaction, not an improvised explosive device.

We are dealing with an improvised explosive device, what we would describe as an anti-personnel fragmentation device, a homemade bomb.

which could easily be converted into improvised explosive devices.

We didn't find anything that outwardly appeared to be dangerous or appeared to be an explosive device.