This happened to me on BTC-E a few months ago too.

Must be very careful with using that exchange. I got the IPs of the people who stole mine and they were baised in ukraine.

I never use BTC-e anymore because of this. Also its pretty funny that after I log into the hacked account. The hackers log into it a few minutes later (probably to check if I deposited more funds) lol Happened twice but stopped now