LOS ANGELES (AP) — NBC's windfall on the Olympics is turning into a downfall for other TV networks.

On Thursday, CBS Corp. Chief Executive Les Moonves became the third major media company executive in three days to acknowledge that the London Olympics were sucking the oxygen out of the advertising market.

Executives at CBS, Time Warner Inc. and Discovery Communications Inc. all said this week that the so-called "scatter" market for last-minute ad buys was experiencing softness. They said advertisers were spending more of their money on commercials for the Olympics, which have been more popular than forecast.

NBC owner Comcast Corp. said Wednesday that it now expects the Olympics to be break-even, or possibly profitable, because of bigger-than-expected audiences. Earlier, it thought the Games would lose $200 million.

Rivals expected the dollars to flow back to their networks after the Games are finished.

"In terms of any softness, I think it's all attributable to the Olympics," Moonves said during a conference call following the release of company's second-quarter earnings results. "It's something that is totally fine, totally business as usual."

Moonves said the market will return to normal in September, when the fall TV season begins and CBS starts to benefit from higher commercial prices that it locked in during the bulk sales period known as the upfronts earlier this year. He also expects political ad sales to break records ahead of the presidential election in November.

"We're ready for the gun to go off in the middle of September," he said.

The CBS executive's comments come a day after Time Warner Chief Financial Officer John Martin told analysts that demand for last-minute commercial buys on networks such as TNT and TBS was "a little slow right now, and that's due to money being diverted to the Summer Olympics."

Discovery CEO David Zaslav said Tuesday that the strength of the Olympics was one of the "hurdles" to overcome for its channels such as Discovery and TLC in the third quarter.

Demand for ads is a concern because the market has been slowing down lately.

For the April-June period, CBS said its advertising revenue fell 3 percent, compared to a 5 percent gain in the January-March quarter. Ad revenue at Time Warner networks rose 2 percent in the quarter, compared to 6 percent in the previous quarter. Discovery's U.S. ad revenue was up 7 percent, compared to a 13 percent gain a quarter earlier.

"I think the question is, 'Is the ad market softening?" said Robin Dietrich, an analyst with Edward Jones. "The economic news as of late has not been all that favorable."

Despite the lukewarm outlook, CBS reported that its net income rose 8 percent in the most recent quarter through June, beating analysts' expectations, even though revenue fell, primarily because of timing issues.

CBS was unable to match last year's second quarter revenue performance because in 2011 it received a large bump from a TV licensing deal with Netflix. Last year also saw the semifinals of the March Madness NCAA college basketball tournament occur during the April-June quarter.

Net income in the three months to June 30 rose to $427 million, or 65 cents per share. That handily beat the 59 cents per share expected by analysts polled by FactSet.

Revenue slipped 3 percent to $3.48 billion, below the $3.53 billion expected.

Advertising revenue fell 3 percent to $2.14 billion while rerun sales fell 8 percent to $816 million. Fees from TV distributors who pay to carry the CBS network and its Showtime channel rose 8 percent to $465 million.

Overall, the company said advertising revenue in the second quarter reflected a "steady marketplace."

Profits went up despite the revenue fall partly because fees from distributors are more profitable than ad sales. The shift of some college basketball games into the first quarter also reduced programming costs in the second quarter.

CBS' stock rose 26 cents in after-hours trading to $33.30. In the last year, it has traded in a range of $17.99 to $35.

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    Artists perform during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

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    An artist performs as a chimney emerges from the ground to symbolise the industrial revolution during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

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    Artists perform during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

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    Artists perform around chimneys during The Age of Industry scene in the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

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    The Olympic rings are assembled above the stadium in a scene depicting the Industrial Revolution during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

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    Rings representing both the Olympics and the Industrial Revolution are lit during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

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    Actors perform during the opening ceremony of the London 2012 Olympic Games at the Olympic Stadium in London on July 27, 2012.

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    Actors perform during the opening ceremony of the London 2012 Olympic Games at the Olympic Stadium in London on July 27, 2012.

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