After some Origin users reported fraudulent activity on their accounts, Electronic Arts launched an investigation to try to determine if a data breach occurred. The DerpTrolling hacker group said they compromised up to 1.7 million Origin accounts and passwords, which is why some users could be reporting unauthorized game purchases.
On gaming forums and Twitter, users are reporting Origin receipts in German and Russian appearing in their email inbox - it would seem likely that this isn't a direct breach of Origin's network, and the fraudsters accessed the stolen information posted online by DerpTrolling.
"We found no indication at this point of a breach of our Origin account database," an EA spokesperson told PCGamer. "Privacy and security of user account information are of the utmost importance to use. We encourage our players to use Origin user ID and passwords that are unique to their account, and to report any activity they feel may be unauthorized to EA customer support at help.ea.com."