More than 100 firefighters and 18 fire engines are battling the blaze which started on the 4th floor of the 12-storey building in Camberwell. A fire brigade spokesman said seven floors of Lakanal House in Havil Street are on fire. "Floors five to 11 are involved in fire and heavy smoke logging," he said. "Twenty-five persons are believed involved. Efforts are being made to rescue them. Ten people have been taken to hospital, the London ambulance service said. Three are in a serious condition and seven are suffering smoke inhalation. Emergency services were called to the scene at 4.20pm.