Texyt is reporting that there have been DoS attacks on some of the major Korean RMT websites, causing them to be difficult or impossible to access for the past four days. The industry in Korea is reportedly up to $1bn trade in gold, weapons and other items, which means these websites are losing a lot of money due to this outage.
There are also reports coming in that the DoS attacks originate from hackers in China - as part of a blackmail scheme to extort money out of the websites being attacked. This isn't the first time these websites have been hit; they also experienced intermittent outage over the last few days of September.
You can read more at the Texyt article.