A group of computer hackers is claiming to have stolen more than one million passwords, email addresses and other information from users of a popular website run by the Japanese electronics giant, Sony.
Lulz Security said it broke into servers that run SonyPictures.com.
In a statement on Thursday, Lulz Security said data was unencrypted, the company having stored passwords in plain text, as well as names, addresses and dates of birth of customers.
Sony Pictures Entertainment executive vice president Jim Kennedy said in a statement that the company was looking into the claims.
In April, hackers broke into Sony's PlayStation Network and stole data from more than 77 million accounts, the BBC reports.
That attack was considered the biggest in internet history and led to Sony shutting down the PlayStation Network and other services for almost a month.
Since then, Sony's networks have become targets for hackers and the company has confirmed at least four other break-ins prior to the claimed attack on Sony Pictures.
The latest alleged attack occurred 24 hours after Sony announced the PlayStation Network would be fully restored in the US and Europe, and said it had beefed up its security systems.
SonyPictures.com features movie trailers and information about films and television shows and also allows users who sign up to receive email updates, AFP reports.