***Update
The video was shot on June 2, 2004 in Kirkuk. The American troops were attacked by rockets that fell short of the base and landed in some dry grass. The dry grass ignited and the flames spread to an old Iraqi ammo dump. So the explosions are from Iraqi munitions, not US munitions.
Amazingly, no one was killed nor seriously hurt! It was reported that there were very few intact windows nearby though.