Updated: April 25, 2011; 11:33 a.m. PDT

Sony has no idea when its PlayStation Network servers will be back online, the company said Monday.

The online gameplay and shopping service for Sony’s PlayStation 3 and PSP has been offline since last Wednesday night. On its blog, Sony cited an “external intrusion” as the reason for the downtime.

Monday, the company said it would be completely retooling the PlayStation Network in a “time intensive process” with no set end date.

If you’ve used a credit card on the PlayStation Network, you might want to keep an eye on your statements: Sony doesn’t yet know if customers’ financial information has been compromised by whoever cracked its servers, a representative told the IDG News Service. Sony did not return Wired.com’s request for comment by press time.

PlayStation Network, which Sony says has around 70 million accounts, provides online gameplay and digital game shopping for owners of PlayStation 3 and PSP devices. Gamers will not be able to download games or play online while PSN is down.

The outage has played havoc with the launches of key online games, most notably Portal 2. The fantastic puzzle game, released Tuesday, allows PlayStation 3 players to team up with users of Valve’s Steam platform on PC and Mac.

Unfortunately, the cross-platform play was only possible for one day. Once PSN went down, no one could play together — nor could they unlock the free Steam version of Portal 2 that was included with the PlayStation 3 version.

Downtime for the PlayStation Network doesn’t just affect multiplayer or online games, though. Some single-player titles like Capcom’s Bionic Commando: Rearmed 2 have DRM that prevent the games from being played at all without an online connection for authentication. Firmware updates are also unavailable.

Though the outage may appear to be the work of Anonymous, which declared “war” on Sony following the company’s lawsuit against hacker George Hotz, the hacker group has disavowed responsibility.