A group of west London mosques have issued a fatwa against littering and fly-tipping.
Imams are warning Muslims that they could face the wrath of Allah if they contribute to making their communities dirtier, and are instructing worshippers that it is their Islamic duty to maintain the cleanliness and general upkeep of their surroundings.
Most non-Muslims still associate a fatwa with the death sentence issued against author Salman Rushdie for alleged blasphemy in his novel Satanic Verses. In reality, it is used to cover a wide range of issues.
The unusual proclamation is being repeated every Friday, the Muslim holy day when mosques are at their busiest in areas such as Southall, Hounslow and Ealing.