A photograph of opera star Katherine Jenkins appeared in an online video in support of the British National Party.

The Welsh singer knew nothing of the image being used and yesterday her spokesman said it had been stolen.

The picture was posted on the video-sharing website YouTube along with a call for people to oppose plans to build Wales's largest mosque in Cardiff.

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Lawyers are investing how a picture of opera singer Katherine Jenkins appeared in an online video supporting the BNP

As well as showing plans for the Madina mosque, the video contrasts stereotypical images of Muslims with images of Wales.

A photograph of a woman in traditional Islamic dress is contrasted with the picture of Miss Jenkins wearing a Welsh rugby shirt, followed by the words: "Stop the Islamification of our nation."

Miss Jenkins's publicist said the mezzo-soprano had no idea her picture had been used in such a way.

"Katherine was totally unaware of the video and the matter is being investigated by our lawyers," he added.

"The image was stolen and used without her permission."

The video was posted three weeks ago by a user under the name of EgbertSaxonKing.

BNP spokesman Simon Darby said it was not an official party video.

"There are so many videos out there it's hard to keep abreast with them all," he added.

"It has probably come from one of our supporters and we support its sentiments."

Mosque chairman Asghar Ali said he was upset about the plans being used to turn people against Muslims.

"I think it's a disgrace, but there's nothing we can do about it."

YouTube said any content deemed to be illegal or inappropriate would be removed.