Senior fire officers are warning of potential safety risks as more and more people let out their houses to tourists through Airbnb and other short term letting websites. The National Fire Chiefs Council says fire and rescue services are not aware of how many short term rental properties are operating in their areas, making it hard for them to assess possible risks. It says some of these properties are being used in effect as small hotels, but if fire officers don't know where places are they can't inspect or give owners advice to ensure buildings are safe.