Millions of users on the PlayStation Network may have had their credit card data and other personal information stolen in a massive security breach, Sony Corp. warned Wednesday.

Hackers attacked the online network from April 17-19. About 77 million people use the PlayStation Network to access games, movies, and television shows through the Internet.

During the breach, user-provided names, birth dates, email addresses, and login information was stolen.

"While there is no evidence at this time that credit card data was taken, we cannot rule out the possibility," Patrick Seybold, a Sony spokesman, said on the company's blog page.

Security analysts said the problem hints that hackers have uncovered a flaw in Sony's network, which could be expensive and time consuming to fix.

It took Sony a week to announce the hack, which has concerned some. Sony said the delay was necessary to "conduct several days of forensic analysis."

Sony hopes to get the network back online next week.