Pretty sure tank was loaded with explosives for effect, either that or ammo protection was poor it cooked off. This is why its best to be in a Western yank rather than a Russian one.
If you have time on your hands try You Tube 1000s to choose from including one tank hit that blows the turret a good 30 feet into the air.
Heres a couple
ATGMs the other view point
http://www.youtube.com/watch?v=8QGG6X5w8qs
Modern day Dragon Knights of old beware, wouldnt mind one for lighting the barbie as we are talking missiles
http://www.youtube.com/watch?v=6ane4jB35Hs