An NCsoft representative has a been in touch to clarify the 11,000 figure, which according to the company relates to "hacked and blocking issues".
ArenaNet has warned Guild Wars 2 players that hackers are using stolen email addresses and passwords from other sites to try and access their accounts.
On Sunday September 2 NC Soft said, via the official Guild Wars 2 wiki, that it had received "approximately 8500 new support tickets related to hacked accounts and other blocking issues" and by Monday September 3 had "helped 2574 players with hacked accounts". Latest updates to the wiki have not included updates to those numbers.
"If you don't want your account hacked, don't use the same email address and password for Guild Wars 2 that you've used for another game or web site," ArenaNet wrote on the wiki, as reported by ArsTechnica
"Hackers have big lists of email addresses and passwords that they've harvested from malware and from security vulnerabilities in other games and web sites, and they're systematically testing Guild Wars 2 looking for matching accounts."
One of the sites accessed by hackers was a Guild Wars fan site.