Sony has reset passwords for a number of PlayStation Network and Sony Entertainment Network users because of "irregular activity" detected by its security team.

E-mail messages were sent early this morning to affected account holders.

The company hasn't given details of the irregular activity, but it could have something to do with a recent security breach at Adobe or leaked passwords from Facebook, Twitter and other online accounts.

Here is a copy of the message sent to account holders:

Posted by Karla Marquez