By Anna Molin 

STOCKHOLM--Swedish clothing chain Hennes & Mauritz AB (HM-B.SK) Thursday posted lower sales in October at stores open for at least a year, with analysts citing a slump in sales in its biggest market Germany and intensifying price wars among fast-fashion retailers.

H&M, the world's number two retailer after Zara-owner Inditex S.A. (ITX.MC), said sales at comparable stores fell by 5% in October, a sharp decline from the 6% increase in the previous month and below forecasts for a 0.1% rise. H&M said total October sales in local currencies increased by 4%, down from a 15% sales jump in September and below the 9.6% increase seen by analysts. October included one weekend less than last year.

Analysts pointed to likely weaker sales in Germany, where H&M derived nearly 22% of sales in the nine months to Aug. 31. According to statistics from trade magazine TextilWirtschaft, the German clothing market contracted by 4% in October from a year earlier, following a 5% sales increase in September.

"The most worrying thing is that November sales might not be any better because the first two weeks of November have also been weak in the German clothing market," Societe Generale retail analyst Anne Critchlow said.

An H&M spokeswoman declined to comment.

German apparel sales in the week ending Nov. 4 dropped 2% compared with the same week in 2011, according to TextilWirtschaft and the slide continued in the week ending Nov. 11, with clothing sales down 5% on the year. The so-called "young fashion" segment targeting teenagers to people in their early 20s, a key focus for H&M, saw the biggest decline, down 11% on the year in the second week of November.

Retailers had been expecting a rise in clothing sales due to colder weather.

Data Thursday confirmed a slowdown in German economic growth in the third quarter when gross domestic product expanded by 0.2%, down from 0.3% in the second quarter and 0.5% in the first three month of the year.

A slowdown in the euro zone's biggest economy would be a severe blow to European retailers already suffering from sluggish consumer spending in much of the rest of Europe. H&M, known for its cheap-and-chic duds, also faces increasing pressure from discount retailers like Primark, and U.S. chain Forever 21 opening more stores in core markets like the U.K.

"We're starting to see even more competition in the value space where H&M is competing... that sector is really where the fierce competition is right now," Jamie S. Merriman, analyst at Bernstein Research, said.

H&M has previously fought back against increased low price competition by cutting prices further, causing some investors to complain the company is sacrificing margins to gain volume and market share. Ms. Merriman said she wouldn't be surprised if H&M again lowered its prices to up its competitiveness.

-Write to Anna Molin at anna.molin@dowjones.com; Twitter: @DowJonesNordics

(Sarah Sloat contributed to this report.)

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