The official site reported yesterday that their game databases were hacked causing them to shut down the servers. The following post was made on their home page at 2:05AM on the 17th:
We have shut down the servers due to hackers that are hacking the database. Please be patient while we investigate this matter.
It was then followed by this statement at 11:27PM:
Players please take note that for security purposes, we have decided not to bring up the servers until 24 hours later. This is because we would like all of you to change your account passwords for security reasons. Please change your password AS SOON AS POSSIBLE. If you see this message, please spread the word and tell your friends to change their account passwords as well. Server will be up in 24 hours´ time with data from 15/04/04 3am (GMT +8).
To keep up with this dangerous matter, we suggest you follow the official site at this link.