well.. i found hundreds of pages saying the contraire, including BMW German reports etc..
but as you might want an Internal opinion this is what
U.S Energy department think about hidorgen vehicles:
Technical Report: Hydrogen safer than gasoline (Hydrogen) energyportal24.com
and i quote: Swain concluded: "No car is perfectly safe, but hydrogen is safer than gasoline."
and here another link of Why:
EVWORLD FEATURE: Hydrogen Car Fire Surprise:HYDROGEN | FIRE | GASOLINE | FLORIDA | SWAIN | FUEL CELL | TANKS
If you google aboout safety of hybrid cars youll find hundred of reports, but even you try harder to find a decent report saying the contraire you wont, i could find just a yahoo answer saying the contraire!

o and wasnt choosed as best answer.