More than 500 people are now known to have died in floods in south-eastern Brazil, the country's worst natural disaster for several decades. Heavy rain has led to massive mudslides hitting several towns, resulting in thousands being made homeless. Police say the number of dead is likely to rise further. Rescue workers will resume searching for survivors in the mountainous Serrana region later today.The Brazilian military have brought in a field hospital and hundreds of people have taken refuge in the gymnasium in Teresopolis. But the number of injured was threatening to overwhelm the medical services. On her visit to the area, President Dilma Rousseff promised a shipment of seven tonnes of medicines. Mayor of Teresopolis said, there are three or four neighbourhoods that were totally destroyed in rural areas. In the neighbouring town of Petropolis also some areas have been completely devastated by the floods and mudslides.