Two people were found dead after up to 50 people were engulfed in a landslide that hit a coastal motorway in the Brazilian state of Parana on Wednesday.
Six people have been rescued alive since the landslide, state officials said.
Officials said it was impossible to say how many passengers were travelling in the 16 vehicles known to have been hit by the landslide and the number of victims could differ from the estimate.
"It's hard to know the exact number of victims. A vehicle could have one to five people inside. We're working with an estimate of 30 to 50 people missing," said emergency response chief Manoel Vasco.
The landslide hit the BR-376 motorway in the city of Guaratuba after intense and continuous rain in the region.
Aerial images released by the emergency services showed a massive smear of mud that swept away everything in its path ― including a chunk of motorway and the vehicles on it.
Rescue workers said the bad weather and remote location were complicating the search effort.
They are using drones with heat-detecting cameras in the hope of finding survivors.
"Fifty-four firefighters have been working non-stop for more than 35 hours," the Parana state security authority said in a statement on Wednesday, noting also the concern over further landslides.
Among the six survivors was Guaratuba mayor Roberto Justus.
In a video on social media, Mr Justus said he was “alive by the grace of God”, AFP news agency reported.
“It was horrible,” he said. “The mountain just fell on top of us. It swept away every last car.”
“The teams are working around the clock,” Mr Vasco said. “The situation in the area, which is already at risk, is likely to get worse in the coming days if it continues like this.”
Mr Vasco said rescuers had to tread carefully, because more landslides could happen, especially as the rain is expected to get worse. The motorway lane is also at risk of giving way due to the weight of the debris.
The BR-277 road to Paranagua and Antonina ports has been closed to traffic towards the coast since Tuesday.
About 80 per cent of goods exported from Paranagua, Brazil's second-biggest port for grain and sugar, arrive by lorries, the port authority said, declining to estimate losses from the disruption.
Brazil is frequently hit by deadly landslides.
The national weather service Inmet has issued heavy rain warnings for several states.
At least one other person died on Wednesday after a section of road was washed out, sweeping away the victim's car, in the north-eastern state of Segipe, Brazilian media reported.
In February, more than 200 people were killed in a series of landslides in the picturesque south-east tourist town of Petropolis.
In April, torrential downpours triggered flash floods and landslides across Brazil's Rio de Janeiro state, killing at least 14 people including eight children and leaving five missing.
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The End of Loneliness
Benedict Wells
Translated from the German by Charlotte Collins
Sceptre
The specs: 2018 Honda City
Price, base: From Dh57,000
Engine: 1.5L, in-line four-cylinder
Transmission: Continuously variable transmission
Power: 118hp @ 6,600rpm
Torque: 146Nm @ 4,600rpm
Fuel economy, combined: 5.8L / 100km
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The biog
Favourite hobby: taking his rescue dog, Sally, for long walks.
Favourite book: anything by Stephen King, although he said the films rarely match the quality of the books
Favourite film: The Shawshank Redemption stands out as his favourite movie, a classic King novella
Favourite music: “I have a wide and varied music taste, so it would be unfair to pick a single song from blues to rock as a favourite"
Results
International 4, United States 1
Justin Thomas and Tiger Woods (US) beat Marc Leishman and Joaquin Niemann (International) 4 and 3.
Adam Hadwin and Sungjae Im (International) beat Xander Schauffele and Patrick Cantlay (US) 2 up.
Adam Scott and Byeong Hun An (International) beat Bryson DeChambeau and Tony Finau (US) 2 and 1.
Hideki Matsuyama and C.T. Pan (International) beat Webb Simpson and Patrick Reed (US) 1 up.
Abraham Ancer and Louis Oosthuizen (International) beat Dustin Johnson and Gary Woodland (US) 4 and 3.
Graduated from the American University of Sharjah
She is the eldest of three brothers and two sisters
Has helped solve 15 cases of electric shocks
Enjoys travelling, reading and horse riding
PAST 10 BRITISH GRAND PRIX WINNERS
2016 - Lewis Hamilton (Mercedes-GP)
2015 - Lewis Hamilton (Mercedes-GP)
2014 - Lewis Hamilton (Mercedes-GP)
2013 - Nico Rosberg (Mercedes-GP)
2012 - Mark Webber (Red Bull Racing)
2011 - Fernando Alonso (Ferrari)
2010 - Mark Webber (Red Bull Racing)
2009 - Sebastian Vettel (Red Bull Racing)
2008 - Lewis Hamilton (McLaren)
2007 - Kimi Raikkonen (Ferrari)
The biog
Favourite car: Ferrari
Likes the colour: Black
Best movie: Avatar
Academic qualifications: Bachelor’s degree in media production from the Higher Colleges of Technology and diploma in production from the New York Film Academy
Know your Camel lingo
The bairaq is a competition for the best herd of 50 camels, named for the banner its winner takes home
Namoos - a word of congratulations reserved for falconry competitions, camel races and camel pageants. It best translates as 'the pride of victory' - and for competitors, it is priceless
Asayel camels - sleek, short-haired hound-like racers
Majahim - chocolate-brown camels that can grow to weigh two tonnes. They were only valued for milk until camel pageantry took off in the 1990s
Millions Street - the thoroughfare where camels are led and where white 4x4s throng throughout the festival
Bio
Born in Dibba, Sharjah in 1972.
He is the eldest among 11 brothers and sisters.
He was educated in Sharjah schools and is a graduate of UAE University in Al Ain.
He has written poetry for 30 years and has had work published in local newspapers.
He likes all kinds of adventure movies that relate to his work.
His dream is a safe and preserved environment for all humankind.
His favourite book is The Quran, and 'Maze of Innovation and Creativity', written by his brother.
India cancels school-leaving examinations
RESULT
Chelsea 2
Willian 13'
Ross Barkley 64'
Liverpool 0
RESULTS
5pm: Maiden (PA) Dh80,000 1,600m
Winner: Raghida, Szczepan Mazur (jockey), Ibrahim Al Hadhrami (trainer)
5.30pm: Maiden (PA) Dh80,000 1,600m
Winner: AF Alareeq, Connor Beasley, Ahmed Al Mehairbi
6pm: Arabian Triple Crown Round-2 Group 3 (PA) Dh300,000 2,200m
Winner: Basmah, Fabrice Veron, Eric Lemartinel
6.30pm: Liwa Oasis Group 2 (PA) Dh300,000 1,400m
Winner: AF Alwajel, Tadhg O’Shea, Ernst Oertel
7pm: Wathba Stallions Cup Handicap (PA) Dh70,000 1,600m
Winner: SS Jalmod, Richard Mullen, Satish Seemar
7.30pm: Handicap (TB) Dh100,000 1,600m
Winner: Trolius, Ryan Powell, Simon Crisford
Our legal columnist
Name: Yousef Al Bahar
Advocate at Al Bahar & Associate Advocates and Legal Consultants, established in 1994
Education: Mr Al Bahar was born in 1979 and graduated in 2008 from the Judicial Institute. He took after his father, who was one of the first Emirati lawyers
The biog
Name: Dhabia Khalifa AlQubaisi
Age: 23
How she spends spare time: Playing with cats at the clinic and feeding them
Inspiration: My father. He’s a hard working man who has been through a lot to provide us with everything we need
Favourite book: Attitude, emotions and the psychology of cats by Dr Nicholes Dodman
Favourit film: 101 Dalmatians - it remind me of my childhood and began my love of dogs
Word of advice: By being patient, good things will come and by staying positive you’ll have the will to continue to love what you're doing