Britain's competition regulator has confirmed that Rupert Murdoch's UK newspaper empire will be drawn into an inquiry into BSkyB's acquisition of a 17.9% stake in ITV.

The Competition Commission said its investigation would cover the newspaper titles owned by News International - a major shareholder in BSkyB - as it outlined the full scope of the probe.

News International, the UK subsidiary of News Corporation, owns newspapers including The Times, the Sunday Times, the Sun and the News of the World.

The commission said it would look at the 'ownership link' created between the news groups and whether 'this could lead to a reduction in the plurality of provision of news and/or current affairs within the UK as a whole'.

The Competition Commission launched its inquiry in May after the Office of Fair Trading and Ofcom said Sky's holding in ITV raised 'significant' competition and public interest concerns.

Sky's £940m move last November to snap up the ITV shares also caused controversy after scuppering Virgin Media's ITV merger plans, drawing fire from major Virgin Media shareholder Sir Richard Branson.

The commission said it had initially identified six potential ways in which Sky's holding could result in a 'substantial lessening of competition', although it stressed it had yet to reach any conclusions.

The list covers the possible loss of competition in the premium pay-TV market, the sports rights bidding process and the provision of television news, with the holding creating a link between Sky News and ITN, which provides news to ITV.

Rival broadcasters had condemned Sky's ITV holding in their submissions to the Competition Commission, published last Friday.

Sky, which is yet to make its submission to the inquiry, maintains that the ITV stake is merely a long-term investment and claims it has not broken any merger rules.

The commission aims to report back with preliminary findings in mid-September, with the deadline for its final report to be sent to the newly-created Department of Business, Enterprise and Regulatory Reform by November 7.