I just found out that there was an
unauthorized withdrawal of exactly 60 BTC from my Mt. Gox account.

I could still access my account and change my password. Weirdly (but luckily), only 60 BTC were transferred - which is about half of my bitcoins.
I know that at current market price, 60 BTC isn't a lot for some of you - but they are of high value for me, a student without regular income.
Now the big question is: Was my password stolen (if so, why weren't over 120 bitcoins stolen, but only 60 ?) or did Mt. Gox make a mistake ?

(previous password: 15 upper- and lowercase letters, symbols and numbers)
I contacted Mt. Gox, but they're only saying that I should report it to the police and send them a copy of the police report. I think you can all understand, that I'm pissed right now...
Has the same happened to any of you before ? I fear there is absolutely no way that I'll ever get those 60 BTC back... right ?