Around 100 people have died in the Brazilian state of Rio de Janeiro after the most torrential rain for decades caused landslides and flooding.
A state of emergency has been declared and officials have warned the death toll may rise as many more are missing.
At least 33 people died in Rio de Janeiro city after 28cm (11in) of rain fell in 24 hours, while 33 were killed in the neighbouring city of Niteroi.
Many houses Rio's hillside shanty towns were buried under mudslides.
President Luiz Inacio Lula da Silva has urged residents to leave their homes if they are at risk of flooding.
Chaotic situation
Authorities say Rio's transport system is close to collapse, after traffic ground to a halt with many streets under water.
"The situation is chaos," Mayor Eduardo da Costa Paes said in a statement on Tuesday. "All the major streets of the city are closed because of the floods."
"Each and every person who attempts to enter them will be at enormous risk," he warned.
Mr Paes said the preparedness for heavy rainfall in Brazil's second-largest city - which will host the 2014 World Cup and 2016 Olympic Games - was "less than zero".
State governor Sergio Cabral meanwhile declared a state of emergency and urged people in high-risk areas to leave their homes.
He told TV Globo that to stay inside would be "irresponsible" given the risk of new landslides.
The victims of shantytown landslides in the city of Rio de Janeiro included a five-month-old baby and a nine-year-old child, officials said.
Flooding left another 12 people dead in Sao Goncalo, and one in Petropolis.
The continuous rainfall also forced Santos Dumont airport, which handles domestic flights, to close for two hours on Monday night, causing a number of delays.
Many cars were left abandoned on main roads throughout the city.
The head of Rio de Janeiro's civil defence department told TV Globo the amount of rain that had fallen was "more than any city is capable of supporting".
Paulo Marqueiro, a reporter for the newspaper O Globo, told the BBC it was like the city had "collapsed".
Houses had been brought crashing down by the floods and landslides, and there was no public transport whatsoever, he said.
'Pray to God'
BBC News website reader Antonio Queiroz Junior said it had started raining after 1700 (2000 GMT) on Monday, during the rush hour.
Rio de Janeiro has experienced a particularly hot and rainy summer
"It hasn't stopped raining since then," he said. "This is the worst storm in decades."
He added: "The city has been abandoned by our government. The current situation is unacceptable, with so many people getting killed because of the rain.
"Everybody knows the danger of living in the hills, and the government does nothing to stop more and more people building houses there."
Mr da Silva, who was visiting the city on Tuesday, blamed local officials for not enforcing adequate building standards in areas prone to landslides, particularly in shantytowns.
"All we can do is pray to God to hold back the rains a little, so that Rio can return to normal, and so that we can set about fixing the things in the city that need fixing," he told local radio.
The president said the work would include improved drainage systems.
Rio de Janeiro state has experienced a particularly hot and rainy summer this year, and meteorologists are forecasting more rain in the coming days. However, correspondents say heavy rain is more common in January than in April.
In January, at least 39 people were killed by mudslides in the resort area of Angra dos Reis, half way between Rio de Janeiro and Santos.
