Controls on rental accommodation are being stepped up as part of an attempt to eradicate prostitution, pyramid schemes and other crimes taking place under the cover of leased homes. In a joint statement issued on Wednesday, six government agencies including the Ministry of Public Security and the Ministry of Civil Affairs underlined the need for landlords to lodge a letter with the local public security office specifying the details of their rental arrangements. They are banned from leasing the dwelling for the making, selling or storing of explosives, poisons and other dangerous materials. Landlords are also prohibited from encouraging or allowing prostitution, gambling or the production of pornography. Insiders said the authorities were restating a decades-old regulation to prevent a new wave of crimes committed by migrants. 'The migrant population is increasing day by day and the house-leasing sector has developed rapidly as the urban and rural economies grow,' the joint statement said. 'Illegal activities or crimes carried out in rented houses have become a more significant problem.' A house-leasing registration officer from Beijing's Jianguomen police said the regulation was designed to control potential leasers such as prostitutes, Falun Gong practitioners and people without jobs, homes or identification. An officer from Beijing's Dongcheng district said police would be sent door to door to crack down on illegally rented accommodation. 'Landlords found leasing a house without registering the leaser with the police will be fined up to 10 times the monthly rent and the occupants evicted,' the officer said. 'The landlord will be held accountable if a crime is found to have been committed by an unregistered occupant.'