An eyebrow-raising poster campaign has provoked vigilante action in Bradford.

The bottom half of a revealing Organics Color Activ shampoo billboard in Jacob Street, off Manchester Road, has been daubed with paint.

Posters for the hair dye, which show a model glancing into her bikini bottoms, bear the provocative caption "Keeps hair colour so long, you'll forget your natural colour".

In Bradford, the posters have appeared at several sites off Manchester Road and in a high-profile position in Leeds Road - to the outrage of Barry Malik, co-ordinator with the Asian Disability Awareness Action group.

"I think it's gone beyond all the decent standards and we don't need it. This type of poster is not acceptable in any culture. It is a disgrace and disrespectful to all women," he said.

"Leeds Road, especially, is truly a multi-cultural district of Bradford and to display this type of poster in that part of the city is deliberately offensive to the residents there."

In June, a poster featuring a scantily-clad image of Russian tennis star Anna Kournikova was vandalised after provoking similar reactions in Bradford.

The national Advertising Standards Authority has received about 20 complaints about the newly-launched Organics campaign, and expects more.

A spokesman said: "We know about this poster and we've been getting complaints since it started going up last week.

"We'll be having a look at the poster before the ASA council meets to discuss the case, and if it deems it offensive we could ask for the poster to be withdrawn."

Opinions on the streets of Bradford about the new poster were not so clear cut, according to a Telegraph & Argus straw poll. Sajida Saberl, who lives near the site of the defaced poster in Holme Top, said: "I don't really think it is offensive. It doesn't offend me - I've seen worse."

Mother-of-two Miss S Mayo, said: "We've got to accept it. It's just part of the modern world. It doesn't bother me and it doesn't bother my kids."

But Yaqub Mohammed, who works at Manchester Road Private Hire, said he was concerned.

"It is offensive to me, because it is so explicit,'' he said.