RIO DE JANEIRO, April 7 Flooding and mudslides from the heaviest deluge ever recorded in Rio killed at least 100 people and left many more homeless, officials said on Wednesday as the rain finally began to ease.

At least 2,000 people were forced from their homes by punishing rain that filled streets with raging torrents and ground Brazil's second-biggest city to a halt the previous day. All told, about 11 inches (28cm) fell in the space of 36 hours.

“When the man upstairs sends us this much rain, there isn't a thing that anyone can do,” Pedro Souza said as he tried to unclog a sewer drain with a broom outside an apartment building in Copacabana.

The death toll was expected to rise as rescue workers picked through tons of mud that barrelled through precarious, hillside slums, where most of the deaths were registered.

Rio de Janeiro state Gov Sergio Cabral declared a three-day mourning period, and children were kept from schools for a second straight day.

As the sun began to emerge in parts of Rio, streets that had teemed with floodwaters now filled with traffic as many residents returned to work.

Rio Mayor Eduardo Paes urged people to stay home, however. “The situation improved ... but the less people are on the streets, the better,” Paes told GloboNews TV.

“People should not go out if they don't have to.”

The city remained on alert amid fears that more rain could dislodge saturated ground and cause more slides, Paes said. Authorities reported 104 people injured and 65 missing.

Pockets of rains continued to cause trouble.

Some roads were still underwater, and a Copa Libertadores match between Flamengo and Universidad de Chile was postponed until Thursday because of damage at Maracana stadium. The Copa Libertadores is Latin America's most important football club competition.

Officials said potential mudslides threatened at least 10,000 houses in the city of six million people.

Some criminals took advantage of the traffic jams to rob stranded motorists, police reported.

Julia Freitas, a 25-year-old university student, told O Globo newspaper she was approached in her car by a group of men offering help. “When I rolled down my window, one put a shard of glass to my neck and took my watch, cell phone and purse,” Freitas said.

Officials downplayed the possibility of similar downpours derailing World Cup matches in 2014 or the Olympics in 2016, noting that those events are not scheduled to be held during the nation's rainy season.

Forecasters predict more rain through the weekend, though it is expected to be lighter.

The killer floods also wreaked havoc with air traffic, delaying most international flights in and out of Rio's Antonio Carlos Jobim airport and forcing the cancelation of many domestic services.

In a neighborhood close to the mountain where Rio's iconic Christ the Redeemer statue is located, the local weather service said the recent rainfall was twice the amount normally registered for the whole month of April.

President Luiz Inacio Lula da Silva criticized decades of administrative malfeasance which allowed shoddy home construction in high-risk zones of the city's shantytowns.

Lula said officials had for too long closed their eyes to substandard building standards, even on Rio's landslide-prone hills, and vowed that his government would work to improve the quality of construction in these areas.

“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,” the Brazilian leader told local radio on Tuesday.—Agencies