TOKYO (AP) - Japanese police have arrested two additional people on suspicion of trying to extort money from Softbank Corp. after obtaining personal data on as many as four million subscribers to the Internet company's broadband service, media reports said Monday.

The two - Yutaka Tomiyasu, 24, and Takuya Mori, 35 - are accused of obtaining company passwords to hack into Softbank's database from an Internet cafe in Tokyo, the national Yomiuri newspaper said, citing unidentified police sources.

The two allegedly passed the information to members of a right-wing extremist group, the Yomiuri and other major dailies said. Four members of the extremist group were arrested in February for allegedly threatening to publicly release the information unless Softbank paid them $9 million to $18 million US.

A Tokyo Metropolitan Police spokeswoman declined to discuss the reports. Softbank officials couldn't immediately be reached for comment.

Earlier this year, Tokyo-based Softbank, a global investor in Internet businesses, said the information leaked included addresses, names, e-mail addresses and phone numbers of 4.51 million current and former subscribers. The company said the data did not include passwords, credit card information, bank account numbers or transaction information.

A Softbank investigation in March found it likely that a worker with access to the company's computer system - not a hacker - was responsible for the leak, but found no concrete evidence against any employee.

Japanese media said Tomiyasu told police he obtained the computer password from a former temporary worker at Softbank.

Softbank has been trying to dominate the growing broadband market in Japan with its Yahoo! BB broadband service and has reported three straight years of losses to woo customers.

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