More TV networks want to gain from tobacco companies' mandate to run anti-smoking ads that will cost tens of millions of dollars.

Fox Broadcasting and the company behind MTV, Comedy Central and BET argue that a court-ordered plan to air anti-tobacco ads on ABC, CBS and NBC won't do a good job reaching young adult and black viewers. Those populations were aggressively targeted by the tobacco industry and are areas of concern for the public health community.

Fox, which is owned by Rupert Murdoch's Twenty-First Century Fox Inc., and Viacom Inc. are asking the U.S. District Court in Washington, D.C., to include its channels in the anti-smoking ad purchase.

The required ads stem from a 2006 ruling that the nation's largest cigarette makers concealed the dangers of smoking for decades. A judge ordered the tobacco companies to pay for corrective statements related to issues such as the adverse health effects of smoking, the addictiveness of smoking and nicotine and the negative health effects of secondhand smoke. The companies involved in the case include Richmond, Va.-based Altria Group Inc., owner of the biggest U.S. tobacco company, Philip Morris USA; No. 2 cigarette maker, R.J. Reynolds Tobacco Co., owned by Winston-Salem, N.C.-based Reynolds American Inc.; and No. 3 cigarette maker Lorillard Inc., based in Greensboro, N.C.

Along with the TV ads, the tobacco companies are also meant to publish statements in newspapers, websites and on cigarette packs.

The tobacco companies and the federal government last month agreed on how to publish the statements. The court must still approve the deal.