Early this morning, around 6:00 AM Eastern, a hacker seized control of Square Enix's European Twitter account (via Eurogamer).
The hacker posted a series of messages proclaiming his or her hacking prowess and posted incendiary message about Square's games and other companies such as Tech Crunch and EA.
A hacker group known as Cyber Wolf appears to have been behind the attack, judging by the appearance of "#cyberwolf" in one of the group's tweets linked to the Square Enix Twitter compromise.
The group also wrested away control of the publisher's Just Cause Twitter account (via Polygon).
Square eventually regained control of both Twitter accounts, but never before damage was done. Square's followers dropped from around 151,000 to 50,000. The numbers have been rolled back.
"Sorry about that folks, that shouldn’t have happened. Thanks for your support and understanding over the past few hours," Square Enix Europe tweeted after the dust settled.