Worshippers at about 500 British mosques have heard sermons condemning the sexual grooming of children after a number of paedophilia cases involving Muslim gangs.
The latest case involves seven men, most of Pakistani origin, who were convicted of running a paedophile grooming ring in the university city of Oxford. Five were given life sentences on Friday and two jailed for seven years.
"We have been horrified by the details that have emerged from recent court cases and as Muslims we feel a natural responsibility to condemn and tackle this crime," said Ansar Ali, spokesman of the campaign group Together Against Grooming.
"The Koran and traditions of our prophet exhort us to act against evil and injustice, and create just societies," he said.
The campaign has been supported by key Muslim groups, including the Muslim Council of Britain, the Mosque and Imams National Advisory Board and the Islamic Society of Britain.