Accounts emptied

I have recently discovered and reported unauthorised transactions in 2 of my bookmaker accounts.

In both cases, my full balance was transferred to the bookmaker's poker site and the amount lost.

At this stage both companies will check the IP address of the computer used in the transaction and the log of the game(s) "played". (I assume this is to see if it was just malicious (i.e. someone just wanted to empty my account) or an attempt at financial gain (by dumping chips to an accomplice at the same table).

As both accounts had the same username/password it seems likely that someone has discovered these details and used them to access my account.

I am interested in finding out if anyone here has suffered a similar problem and what the eventual outcome was.

Or if anyone can point me in the direction of a source of information on this topic.

I need to establish if I need to take any further action (independently of the bookmakers concerned) to try to recover these funds.