Sony's security team has detected "irregular activity" and thus reset a number of PlayStation Network and Sony Entertainment Network passwords this week, emails to users obtained by The Verge show.

　　The extent of this "irregular activity" was not detailed and it is unclear how many users are being asked to change their passwords. PlayStation supporters will no doubt recall the widespread 2011 PlayStation Network hack that brought the service down for months.

　　The emails from Sony also encourage account owners to use "complex" passwords that are unique to Sony's various services. "As always, we also encourage you to keep a close eye on your account for any unusual activity including emails about transactions you did not perform," Sony said.

　　This news comes during the same week that a hacker made off with more than 2 million passwords for users of major sites and services, including Facebook, Twitter, and Gmail.

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