Britain's most senior police officer has resigned amid an investigation of the phone hacking scandal at Rupert Murdoch's British newspaper operations.
Police have launched inquiries into allegations of the hacking of phone voicemail messages by journalists at the now-closed News of the World tabloid and claims reporters bribed police for information.
Metropolitan Police Commissioner Sir Paul Stephenson said he had no knowledge of the extent of the phone hacking and said his integrity was completely intact.
Sir Paul said he did not want criticism of his conduct to detract from ensuring security at the Olympic Games, which are due to be held in London next year.
The BBC reports Sir Paul has faced criticism for hiring former News of the World executive Neil Wallis - who was questioned by police investigating hacking - as an adviser.
Brooks bailed
Earlier, police arrested Rebekah Brooks, who quit on Friday as head of Rupert Murdoch's UK unit News International, as part of the investigation.
The 43-year-old former editor of the newspaper has denied she knew of the alleged hacking of thousands of phones, including that of a murdered schoolgirl.
Mrs Brooks was questioned for 12 hours over over claims she conspired to intercept communications and that the News of the World paid police for stories.
She has been bailed to return to police on a date in late October.
The Wall Street Journal is reporting that no charges have been filed.
Rupert Murdoch, James Murdoch and Rebekah Brooks are due to be questioned in Britain's parliament on Tuesday, including over reports that News International misled parliament during earlier hearings.
But Mrs Brooks' spokesperson said her arrest may cast doubt on whether she could appear before politicians.
The BBC reports the arrest in the tenth made police conducting the investigation. Others arrested and bailed have included former News of the World editor Andy Coulson and several former journalists on the paper.
The News of the World, which published its final edition a week ago, is alleged to have hacked up to 4,000 phones including that of murdered 13-year-old Milly Dowler, sparking a furore that forced Murdoch to close the paper and drop a plan to buy all of broadcaster BSkyB .
Mr Murdoch published apologies in several British newspapers at the weekend.
On Friday, Les Hinton, resigned as chief executive of Mr Murdoch's Dow Jones & Co which publishes The Wall Street Journal.
British Prime Minister David Cameron has come under fire for his friendship with Ms Brooks and for employing another former News of the World editor, Andy Coulson, as his press secretary even after he had quit the paper in 2007 following the jailing of a reporter for phone-hacking.
Leading British politicians renewed calls for greater media plurality and press regulation -- a direct threat to Murdoch's empire, which includes The Sun, The Times and Sunday Times broadsheets, and 39% of BSkyB.
