Rescue workers on Friday resumed their search for eight people still missing after a massive landslide in the Swiss Alps while dozens of evacuees waited to return home.

The massive search and rescue operation, involving more than 100 emergency workers equipped with infrared cameras and mobile phone detectors, helicopters and rescue dogs, had been halted overnight for safety reasons.

The landslide, which struck early Wednesday, sent rocks and mud flooding down the Piz Cengalo mountain into the outskirts of Bondo, a village near the Italian border.

The eight missing, who come from Germany, Austria and Switzerland, were hiking in the Val Bondasca region at the time.

Local police said they had set off in separate groups.

- Pessimism -

According to Anna Giagometti, mayor of Bregaglia -- a municipality that encompasses Bondo -- paths in the area had been flagged as "dangerous" earlier this month due to falling rocks.

Speaking to the Blick daily, she said warning signs in several languages had been posted in the village.

There had been fears over the fate of another six people but police said late Thursday they had been found safe on the Italian side of the border.

Police and residents said mobile phone coverage in the area was spotty, voicing hope it could explain why those still missing had not been in touch.

But Swiss President Doris Leuthard, who examined the site from the air on Thursday, admitted the probability that the hikers were dead "is increasing by the hour," Blick reported.

Dramatic footage showed an entire mountainside disintegrating, unleashing an unstoppable mass of thick mud and sludge that tore up trees and demolished at least one building in its path.

Police said 12 farm buildings, including barns and stables, had been destroyed, while the Graubunden canton's main southern highway was closed to traffic.

- Deafening bang -

"It was terrible," Elisa Nunzi told Blick after witnessing the landslide from her home in a higher-altitude village.

The 27-year-old said she heard a deafening bang that sent rocks pouring down the mountain. "There were so many. It did not stop," she said.

Christian Speck, manager of a hotel in Soglio, several kilometres from Bondo, also witnessed the mountainside collapsing.

"At breakfast time, my customers and I saw rocks come lose from the mountainside and slide towards Bondo, in a huge cloud of smoke," he told AFP.

The landslide set four million cubic metres (141 million cubic feet) of mud and debris in motion, its relentless mass stretching 500 metres (1,640 feet) across, according to the regional natural hazards office (AWN).

The event was so severe that the vibrations set off seismometers across Switzerland, measuring the equivalent of a 3.0 magnitude earthquake, according to the Swiss Seismological Service.

- Melting permafrost? -

Experts hinted that climate change could be partially to blame for the disaster, with melting permafrost and an adjacent glacier likely destabilising the landmass.

An alert system put in place after a previous large landslide in the area in late 2011 allowed the authorities to quickly sound the alarm and evacuate around 100 people from Bondo and two Alpine cabins, amid fears of fresh landslides.

The evacuees, who are being hosted in private homes, hotels, hospitals and churches, are still waiting to hear when they will be allowed back home.

Simona Rauch, a Protestant minister at a church in Val Bregaglia, told AFP that residents did not expect to be gone so long.

"People left immediately, leaving everything behind. They didn't bring anything because they thought they would be returning quickly," she said.

"No one expected this kind of catastrophe."

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