i think its outside because if you look the pass glass and windshield are still intact, if it was an explosion all the windows would be out and on the floor .......no?
I remember a great little video for the factory armored 7-series - a guy had a rifle shooting straight at the windows in the same spot over and over again, then they sprayed it with fully automatic rifle fire.
This reminds me of the time my dad got me in to see a demonstration of the Avenger cannon (on the A-10 Warthog nose) at GE (I was in his office using binoculars). For the first test, they shot an M1 Tank from the side and ROLLED IT OVER. The second test actually cut some older tank in half when they shot at it from the top. Neat.