Media baron Rupert Murdoch flew into London on Sunday to tackle a telephone-hacking scandal that has sent tremors through the British political establishment and may cost him a multi-billion dollar broadcasting deal.

Murdoch, 80, was driven through the gates of his east London headquarters holding up the last edition of the best-selling newspaper he had closed only hours earlier in an attempt to contain the crisis. It was not clear what meetings he had planned in the coming hours.

Best known for its lurid headlines exposing the misdemeanors of the rich, royal and famous, the News of the World said simply Thank You & Goodbye over a montage of some of its most celebrated splashes of the past 168 years. For admirers it had been a stock feature of lazy Sundays, for critics it had become a symbol of craven irresponsibility in the British media.

All human life was here, the News of the World declared in a special supplement to its final edition.

Murdoch had seemed on the point of clinching approval for a cherished prize, the buyout of broadcaster BSkyB, only last week; but revelations phone-hacking had extended beyond celebrities to relatives of victims of 2005 London bomb attacks and of soldiers killed in action stirred broad public anger.

Editor Colin Myler told media massed outside the newspaper's

offices he deeply regretted the newspaper's closure.

This is not where we wanted to be and it's not where we deserve to be, but as a final tribute to 7.5 million readers, this is for you and for the staff, thank you.

The scandal has raised questions about relations between politicians, including Prime Minister David Cameron -- who hired a former editor of the paper as his spin doctor -- and media barons such as News Corp chairman and chief executive Murdoch.

It has also brought to light accusations that journalists working for Murdoch and others illegally paid police for information. A senior police officer said the London police force had been 'very damaged' by its failure to press an initial investigation into telephone hacking at the News of the World.

Cameron's opponents have scented an opportunity in their efforts to block Murdoch's $14 billion bid for the 61 percent of the profitable pay-TV operator BSkyB that News Corp, the world's largest news conglomerate, does not already own.

Previously, those looking at whether Murdoch should get the go-ahead have focused on whether it would give him too much power over Britain's media.

But allegations that senior editors were involved in illegally accessing thousands of voicemail messages and paying police for information to get scoops have now prompted the regulator Ofcom to say it will consider whether News Corp directors are fit and proper persons to run BSkyB.

The government has received more than 135,000 public complaints against the BSkyB deal.

This is the most serious political crisis in a generation (for the Murdochs) but as a business crisis it is immense and immensely more significant for the Murdochs than the political crisis is, said Claire Enders of Enders Analysis.

Cameron came under growing pressure on Sunday to halt Murdoch's bid for BSkyB, at least until an investigation into phone-hacking had been completed.

Opposition leader Ed Miliband said he would force the issue to a parliamentary vote this week if Cameron failed to act.

He needs to make clear that BSkyB cannot go ahead until the investigation is complete, Miliband told the BBC's Andrew Marr program.

Pressure came too from members of the government's junior coalition partner, the Liberal Democrats, who have traditionally had a less cozy relationship with Murdoch. Deputy LibDem leader Simon Hughes said he would be prepared to back Labour's call for the deal to be postponed and urged other LibDems to do the same -- setting the stage for a major test of the coalition's unity

LET DOWN

Murdoch, who made the News of the World his first British newspaper acquisition in 1969, told Reuters he expected to leave for London on Saturday afternoon or Sunday and was not planning any management changes as a result of the crisis.

We've been let down by people that we trusted, with the result the paper let down its readers, the News Corp chief executive said as he left a media conference in Idaho. He earlier said closing the paper was a collective decision.

News Corp, whose shares fell more than 5 percent in New York last week, declined to comment on Murdoch's agenda.

Neither Cameron's office nor the Department for Culture, Media and Sport plan to speak to him during the visit, spokespeople said. Police declined to comment on whether they would try to speak to him.

Cameron indicated a new assertiveness toward the Murdoch empire by withholding overt endorsement of News Corp's bid for BSkyB on Friday.

The prime minister's close links with those at the heart of the scandal mean he too has been damaged by it but analysts say that, with probably nearly four years until a parliamentary election, he is unlikely to be sunk by it.

Cameron, a friend of former News of the World editor Rebekah Brooks, joined calls for her to step down as chief executive of News Corp's News International arm at a news conference on Friday where he admitted politicians had been in thrall to media for years, and ordered a public inquiry.

British police on Friday arrested Andy Coulson, the former spokesman for Cameron who had resigned as News of the World editor in 2007 after one of his reporters and a private investigator were convicted of hacking the phones of aides to the royal family. Coulson has also said he knew nothing about the phone hacking.

Brooks indicated in comments to News of the World staff on Friday that more revelations may emerge, a day after telling them the paper had become toxic and would be shut.

HACKING WAS STANDARD PRACTICE

A senior police officer told the Sunday Telegraph that voicemail hacking had been standard practice at the News of the World and that its executives had failed to cooperate fully with police during an investigation in 2005-06. [nL6E7I909Q]

He said the new investigation had been prompted by material that was completely available to them in 2005-06.

It makes their assurances in 2005-06 look very shaky.

The paper said Brooks would be questioned by police in the coming days, citing a senior News International source. Police declined to comment.

The Sunday Times said at least nine journalists and three police officers were facing jail in connection with the hacking scandal and quoted senior police officers as saying it was likely there would be further arrests soon.

Murdoch said on Saturday that Brooks, who was editor of the News of the World at a time when many of the alleged hacking incidents were taking place, had his total support. She denies knowing of the practice during her watch.

I'm not throwing innocent people under the bus, Murdoch said.

Asked if he planned any management changes, for example in the responsibilities of his son and heir apparent James, he said No. Nothing's changed, he told reporters.

Some 200 people at the News of the World are losing their jobs.

The Guardian said on Saturday police were investigating evidence that a News International executive may have deleted millions of emails from an internal archive in an attempt to hamper investigations.

The News International spokeswoman said the allegation was rubbish, adding: We are cooperating actively with police and have not destroyed evidence.

Cameron fleshed out on Sunday how inquiries into the scandal, announced on Friday, would work.

The first, a judge-led inquiry to be held in public, will cover phone hacking and criminal activity and look at the way the police investigated allegations against the News of the World, and the relationship between newspapers and the police.

The second inquiry will be asked to recommend a new framework for press regulation.

(Additional reporting by Olesya Dmitracova, Jodie Ginsberg, Christina Fincher, Sarah McBride, Sudip Kar-Gupta; Writing by Alison Williams; Editing by Kevin Liffey and Janet Lawrence)