As more than 100 people have now died in flooding in the southern Brazilian state of Rio Grande do Sul, the BBC has heard testimonies from some of those affected in the state capital, Porto Alegre. More than 80% of the city's population are without access to clean water after five of the city's six water treatment plants were knocked out, according to local media. "Thousands of people have lost their homes. There's no water anywhere," said resident Suzan. "My mother-in-law is 90 and had to be rescued. It's unbelievable what's happening here," she said. The city council said that jet skis were being stolen and that gangs were stealing water that was being donated. "It's deplorable and needs to be denounced," a spokesman said. Essential supplies are being delivered by boat - including some that have been stolen - and officials have appealed for anyone with a boat "of any kind" to make it available to the authorities. Alexandre Ramos told the AFP news agency that he was forced to leave his home "after everything was destroyed" by the floods. "We tried to wait as long as possible, but the army came and took us and our dogs," he said. Another resident told Reuters that he had "not eaten for three days" and was "with people I don't know, and I don't know where my family is". Almost all of the deaths have been in Rio Grande do Sul, where there have been 100 confirmed fatalities, according to the local Civil Defence Force. The neighbouring state of Santa Catarina has reported one death. Forecasters have warned that the situation could get worse as a cold front moves across the southern part of the state, bringing more rain and colder temperatures this week, according to Brazil's National Institute of Meteorology (Inmet). Rio Grande do Sul, which has a population of 11 million, has been badly affected by climate change. After suffering from severe drought caused by the La Niña weather phenomenon last year, the region has now been hit by the opposite extreme - El Niño - and has seen four extreme weather events caused by extratropical cyclones and storms in less than 12 months. Three of those events happened in 2023 - in June, September and November - and killed 75 people in the state. Read more: UN team ready to help Brazil due to heavy rains in the south (in Portuguese)