While firefighters search for missing people under thick mud, residents in the Brazilian city of Recife can barely sleep.

At least 106 people have died and 10 are still missing in Brazil, the government said on Tuesday, as heavy rains tore through urban towns in the northeastern part of the country for a sixth consecutive day.

Brazil's leftwing Luiz Inacio Lula da Silva officially starts campaign to unseat right-wing president Jair Bolsonaro.

Deforestation in Brazil's Amazon surged to record levels for the month of April, nearly doubling the area of forest removed in that month last year - the previous April record - alarming environmental campaigners.

The UN human rights committee said corruption proceedings against former Brazilian president violated due process.

Heavy rains caused mudslides that killed at least 14 people in southern coastal cities and the Baixada Fluminense area of Rio de Janeiro state.

Two Brazilian Indigenous boys aged seven and nine have been found after surviving 25 days lost in the Amazon rainforest.