More than 1,200 people were killed after catastrophic flash flooding hit China and Nepal on Wednesday, August 26.

The US Geological Survey said a glacial collapse — when a large section of ice breaks off a glacier and falls down a slope — and landslide was behind the disaster. Dramatic footage shows a torrent of water hitting the mountainous region, submerging villages and wiping out bridges.

Thousands of people still remain unaccounted for. Search-and-rescue operations have been hampered by a lack of connectivity, power and resources.

Police and army personnel wear hazmat suits Sunday as they bury unidentified bodies at a mass burial site in Bharatpur, Nepal.
Police and army personnel wear hazmat suits Sunday as they bury unidentified bodies at a mass burial site in Bharatpur, Nepal.
Ezra Acayan/Getty Images
Law enforcement personnel tag pots with numbers to place them over the graves of unidentified flood victims at the mass burial site in Bharatpur.
Law enforcement personnel tag pots with numbers to place them over the graves of unidentified flood victims at the mass burial site in Bharatpur.
Prakash Mathema/AFP/Getty Images
A mark showing the mud level is seen on a wall inside a classroom heavily covered in sludge at the Bageshwori Secondary School in Galchi, Nepal, on Sunday.
A mark showing the mud level is seen on a wall inside a classroom heavily covered in sludge at the Bageshwori Secondary School in Galchi, Nepal, on Sunday.
Manan Vatsyayana/AFP/Getty Images
Sunita Chitrakar holds up her chickens after rescuing them from her house n Devighat, Nepal, on Sunday.
Sunita Chitrakar holds up her chickens after rescuing them from her house n Devighat, Nepal, on Sunday.
Athit Perawongmetha/Reuters
A left-behind water bottle is stuck in sludge at the Bageshwori Secondary School.
A left-behind water bottle is stuck in sludge at the Bageshwori Secondary School.
Manan Vatsyayana/AFP/Getty Images
Damaged buildings are covered in mud next to the Likhu River in Devighat on Sunday.
Damaged buildings are covered in mud next to the Likhu River in Devighat on Sunday.
Athit Perawongmetha/Reuters
A man tries to retrieve a log from the Narayani River in Chitwan, Nepal, on Sunday.
A man tries to retrieve a log from the Narayani River in Chitwan, Nepal, on Sunday.
Navesh Chitrakar/Reuters
Damaged homes are filled with mud and debris in Devighat on Saturday.
Damaged homes are filled with mud and debris in Devighat on Saturday.
Rajesh Kumar Singh/AP
Women view the widened channel of the Trishuli River on Saturday.
Women view the widened channel of the Trishuli River on Saturday.
Ezra Acayan/Getty Images
Members of the Nepal Army load relief material as a helicopter containing relief supplies takes off to areas affected by the flash floods on Saturday.
Members of the Nepal Army load relief material as a helicopter containing relief supplies takes off to areas affected by the flash floods on Saturday.
Athit Perawongmetha/Reuters
A family photograph lies on a mattress covered in mud outside a house in Devighat on Saturday.
A family photograph lies on a mattress covered in mud outside a house in Devighat on Saturday.
Manan Vatsyayana/AFP/Getty Images
Residents carry belongings salvaged from their damaged homes in Devighat on Saturday.
Residents carry belongings salvaged from their damaged homes in Devighat on Saturday.
Rajesh Kumar Singh/AP
People look at photos of victims outside of a government hospital in Kathmandu, Nepal, on Friday.
People look at photos of victims outside of a government hospital in Kathmandu, Nepal, on Friday.
Dar Yasin/AP
People stand on the edge of a broken bridge in Galchi on Thursday.
People stand on the edge of a broken bridge in Galchi on Thursday.
Francis Mascarenhas/Reuters
A resident salvages belongings from his house in Devighat on Saturday.
A resident salvages belongings from his house in Devighat on Saturday.
Rajesh Kumar Singh/AP
A woman impacted by the flash floods is comforted as she arrives at the Maithili Barrack in Trishuli, Nepal, on Friday.
A woman impacted by the flash floods is comforted as she arrives at the Maithili Barrack in Trishuli, Nepal, on Friday.
Navesh Chitrakar/Reuters
Members of the police carry the body of a child in Trishuli on Friday.
Members of the police carry the body of a child in Trishuli on Friday.
Navesh Chitrakar/Reuters
A flash flood survivor gives water to a chicken that was left behind in Devighat on Friday.
A flash flood survivor gives water to a chicken that was left behind in Devighat on Friday.
Niranjan Shrestha/AP
A rescue worker looks at the site of damaged buildings in Trishuli Bazar, Nepal, on Saturday.
A rescue worker looks at the site of damaged buildings in Trishuli Bazar, Nepal, on Saturday.
Manan Vatsyayana/AFP/Getty Images
Reuters journalist Sahana Bajracharya, right, speaks with Matti Maya Tamang and her 8-year-old son, Zoyal Ghale, at a hospital in Kathmandu on Saturday, The boy was airlifted from Nepal's Rasuwa district after being injured.
Reuters journalist Sahana Bajracharya, right, speaks with Matti Maya Tamang and her 8-year-old son, Zoyal Ghale, at a hospital in Kathmandu on Saturday, The boy was airlifted from Nepal's Rasuwa district after being injured.
Ranup Shrestha/Reuters
People on a rooftop look at the damage caused by flash flooding in Trishuli on Thursday.
People on a rooftop look at the damage caused by flash flooding in Trishuli on Thursday.
Arun Sankar/AFP/Getty Images
A girl cries Thursday as she waits for news of missing relatives in the Nepali town of Bidur.
A girl cries Thursday as she waits for news of missing relatives in the Nepali town of Bidur.
Niranjan Shrestha/AP
This aerial photo, taken on Thursday, shows buildings covered in sludge in Devighat.
This aerial photo, taken on Thursday, shows buildings covered in sludge in Devighat.
Prabin Ranbhat/AFP/Getty Images
A rescued woman and her child take shelter at a hospital in Nepal's Nuwakot district on Thursday.
A rescued woman and her child take shelter at a hospital in Nepal's Nuwakot district on Thursday.
Arun Sankar/AFP/Getty Images
Children are carried to a rescue helicopter by military personnel in Nepal's Rasuwa district on Thursday.
Children are carried to a rescue helicopter by military personnel in Nepal's Rasuwa district on Thursday.
Atul Loke/The New York Times/Redux
A woman looks through barbed wire as she waits for updates on the whereabouts of her missing family member outside the Maithali Barrack in Trishuli on Thursday.
A woman looks through barbed wire as she waits for updates on the whereabouts of her missing family member outside the Maithali Barrack in Trishuli on Thursday.
Navesh Chitrakar/Reuters
People gather over a building as a rescue helicopter flies past them in Trishuli.
People gather over a building as a rescue helicopter flies past them in Trishuli.
Arun Sankar/AFP/Getty Images
The banks of the debris-choked Bhote Koshi River show signs of the giant torrent of water, mud and ice that swept through the remote river valley in Nepal's Rasuwa district.
The banks of the debris-choked Bhote Koshi River show signs of the giant torrent of water, mud and ice that swept through the remote river valley in Nepal's Rasuwa district.
Atul Loke/The New York Times/Redux
An injured woman is shifted to a ward from a hospital's emergency unit in Kathmandu.
An injured woman is shifted to a ward from a hospital's emergency unit in Kathmandu.
Sabrina Dangol/Reuters
This aerial photo, taken on Thursday, shows mud covering buildings in Trishuli.
This aerial photo, taken on Thursday, shows mud covering buildings in Trishuli.
Navesh Chitrakar/Reuters
People walk along a road covered by floodwaters in Nuwakot, Nepal, on August 26.
People walk along a road covered by floodwaters in Nuwakot, Nepal, on August 26.
Sunil Pradhan/Anadolu/Getty Images
Police officers carry a survivor in Trishuli on August 26.
Police officers carry a survivor in Trishuli on August 26.
Navesh Chitrakar/Reuters
Mud covers a building in Nuwakot on August 26.
Mud covers a building in Nuwakot on August 26.
Safal Prakash Shrestha/Anadolu/Getty Images
People check a list of names of the injured at a hospital in Kathmandu.
People check a list of names of the injured at a hospital in Kathmandu.
Monika Malla/Reuters
A survivor is transported to a safer place in Trishuli.
A survivor is transported to a safer place in Trishuli.
Navesh Chitrakar/Reuters
An injured man is rushed to a hospital in Trishuli.
An injured man is rushed to a hospital in Trishuli.
Navesh Chitrakar/Reuters
A woman cries as she searches for relatives alonbg the Trishuli River on August 26.
A woman cries as she searches for relatives alonbg the Trishuli River on August 26.
Niranjan Shrestha/AP
A boy looks at the devastation caused by flash flooding in Nepal's Nuwakot district.
A boy looks at the devastation caused by flash flooding in Nepal's Nuwakot district.
Niranjan Shrestha/AP