A bus plunged over a seaside cliff in Peru killing at least 48 people after a collision with a truck on a precarious stretch known as the "devil's curve".
The bus was travelling from Huacho, 130km north of the capital, to Lima with 55 passengers and two crew members on board when it went off the road.
It plunged 100 metres and landed upside down on rocks at the edge of the sea.
Efforts to recover bodies from the overturned vehicle were suspended at nightfall because the tide had risen and reached the bus, the police said.
A police helicopter had winched some rescue workers to the wreck of the blue bus while others made the precarious journey down on foot with the assistance of ropes.
The navy sent a patrol boat to assist the rescuers trying to get everyone out before the tide came in.
There were several survivors, although most on board the bus were killed.
"For us it is very painful to suffer an accident of this magnitude. My deep solidarity lies with the pain suffered by the relatives," President Pedro Pablo Kuczynski wrote on Twitter.
The crash took place on a coastal highway about 45km north of the capital Lima, said Colonel Dino Escudero, head of the police highway patrol division.
The Pasamayo highway on which the tragedy occurred is only used by trucks and buses, as cars travel a different route.
It is a dangerous sea-hugging road where fog is frequent and high humidity can make the roadway slippery.
The bus driver had a lot of experience and was working with an assistant, said a representative of Transportes San Martin de Porres, which owned the bus.
The spokesman could not confirm whether the driver had been killed or injured, but added that the bus underwent a mechanical check before leaving Huacho.
More than 2,500 people died in road crashes in Peru in 2016, according to official figures.