Sony Corp., targeted since April by hacker attacks that have compromised more than 100 million customer accounts, is investigating two new possible intrusions.

The company suspended its Brazilian music entertainment website while it looks into a possible breach, it said Tuesday. Sony is also investigating a hacker group's claim that it stole data related to the company's game operation.

Sony fell Tuesday in Tokyo trading, extending declines amid attacks that the company has said may cost ¥14 billion this year.

Japan's largest exporter of consumer electronics reported the new attacks two days after saying hackers had broken into its European unit's website.

No customer information was accessed during that intrusion, Sony said Monday.

"It's like a cat-and-mouse game," Naoki Fujiwara, chief fund manager at Shinkin Asset Management Co., said of the repeated attacks, which also targeted Nintendo Co. on May 16. The incidents show that companies like Sony and Nintendo will be forced to increase security costs for their online business, he said.

The possible attack on Sony's Brazilian website may have altered some content, spokesman Tomio Takizawa said Tuesday without elaborating.

Separately, a group called Lulz Security posted statements online Monday saying it broke into Sony Computer Entertainment's system to obtain developer network information. Sony is investigating the claim, Satoshi Fukuoka, a company spokesman, said.

Sony said Monday no protected data were accessed during the attack on its European website, which was discovered Sunday.

Nintendo said Monday that a server attacked on May 16 didn't contain consumer information.