Three people are still missing but rescue efforts were halted late on Saturday due to a “lack of natural light” at Lake Furnas in Capitolio.
They will resume on Sunday at 5 a.m. local time, Pedro Ihara, a spokesman for the Minas Gerais fire department, said.
Mr. Aihara said that 23 of the 32 people treated in Santa Casa di Capitolio for minor injuries have been discharged from hospital, while two others in Santa Casa in Biome municipality were treated for exposed fractures.
Mr. Aihara said the rescue efforts would continue at least until Monday, adding that situations such as victims falling under the rock could prolong the work.
Brazilian President Jair Bolsonaro said the Navy has deployed a relief force team to join the search and rescue effort.
Minas Gerais, a landlocked region in southeastern Brazil, has experienced heavy rains recently.
On Friday, Brazil’s National Meteorological Institute issued red warnings for Minas Gerais, where more than 100 mm of rain was forecast per day for at least four days, state media Agência Brasil reported.
It was the heavy rain that loosened the rocks in Lake Furnas, according to Romeo Zima, governor of Minas Gerais.
“I am in solidarity with the families at this difficult time,” Zima wrote on Twitter.
We will continue to work to provide the necessary protection and support.”
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A video posted on social media showed tourists on other boats in Firnas Lake chanting “Get out of there” just before the rock fell.