James Murdoch to testify in hacking inquiry James Murdoch, a senior News Corp. executive, is summoned to face questions Rupert Murdoch is to appear Wednesday at the inquiry into British media ethics Police and lawmakers are also probing phone hacking and police bribery The Murdochs both deny knowing about the scale of illegal actions at their papers London (CNN) -- James Murdoch, a top executive in his father Rupert Murdoch's media empire, is due to appear Tuesday before an independent British inquiry into journalistic ethics prompted by phone hacking at his defunct News of the World tabloid. He already has been called twice to testify before British lawmakers and has consistently denied knowing about the scale of phone hacking at the newspaper. Rupert Murdoch will appear Wednesday and perhaps Thursday morning, according to the inquiry's website. Dozens of people have been arrested in criminal investigations into phone and e-mail hacking and police bribery, and police asked prosecutors last week to charge at least eight people. No charges have been filed yet, and the Crown Prosecution Service said it did not know when a decision would be made about charges. The British government set up the Leveson Inquiry, the independent investigation that summoned the Murdochs, in the wake of the phone-hacking scandal. James Murdoch has been hammered particularly hard. Rupert Murdoch testified before lawmakers in July alongside his son. Police arrested three more people last week, including a journalist at The Sun newspaper, part of Murdoch's News Corp. media empire and Britain's best-selling daily tabloid. London's Metropolitan Police said the arrests were the result of information provided to the force by News Corp.'s Management Standards Committee, an internal panel set up by the company to probe suspected misconduct. The British lawyer representing dozens of alleged News Corp. phone-hacking victims was in New York last week, exploring options for a U.S. case against the company. Attorney Mark Lewis told CNN he is representing three or four new clients, one of whom is believed to be a U.S. citizen, who say their phones were hacked while they were on U.S. soil. There are also many potential new clients, Lewis said. "As I've been traveling here," he said, "I've been contacted by many people who've had, so they say, similar problems -- not just hacking, but maybe being trailed, or have fallen out with some American Murdoch News Corp. company, and then found themselves, as they would say, at the wrong end of investigations, the wrong end of information gathered." CNN's Claudia Rebaza and Bharati Naik contributed to this report.