BBC reported that thousands of people are being evacuated downstream of a major dam which has been blown up in Russian-held Ukraine.

President Zelensky said 80 towns and villages were at risk of flooding after the destruction of the dam at Nova Kakhovka, which he blamed on Russia. Water is surging down the Dnipro river and is said to pose a catastrophic flooding risk to the city of Kherson.

Russia has denied destroying the dam – which it controls – instead blaming Ukrainian shelling. Neither Ukraine or Russia’s claim has been verified by the BBC.

The Kakhovka dam is crucial in the region. It contains a reservoir, which provides water to farmers and residents, as well as to the Zaporizhzhia nuclear power plant. It is also is a vital channel carrying water south to Russian-occupied Crimea.

Video footage shows a torrent of floodwater gushing through a breach in the dam. Several towns are already flooded, while people in areas further downstream were forced to flee by bus and train.

Around 40,000 people need to be evacuated, Deputy Prosecutor-General Viktoriya Lytvynova said on Ukrainian television – 17,000 people in Ukraine-controlled territory west of the Dnipro River and 25,000 on the Russian-controlled east.

At least 261 people have been killed and 650  injured in a crash involving three trains in India’s eastern Odisha state, officials say.

One passenger train derailed and its coaches fell on to the adjacent track where they were struck by an incoming train on Friday evening. A freight train was stationary.

The rescue operation at the crash site has ended, officials said.

The cause of India’s worst train crash this century is not yet clear. Officials said several carriages from the Shalimar-Chennai Coromandel Express derailed at about 19:00 (13:30 GMT) in Balasore district, hit a stationary goods train and several of its coaches ended up on the opposite track. Another train – the Howrah Superfast Express travelling from Yesvantpur to Howrah – then hit the overturned carriages.

“The force with which the trains collided has resulted in several coaches being crushed and mangled,” Atul Karwal, chief of the National Disaster Response Force (NDRF) told news agency ANI.

It was the third deadliest crash in the history of Indian railways, he said.

More than 200 ambulances and hundreds of doctors, nurses and rescue personnel were sent to the scene, the state’s chief secretary Pradeep Jena said.

Sudhanshu Sarangi, Director General of Odisha Fire Services, had earlier said` 288 had died. The rescue operation recovering people from the wreckage has finished and work to restore the site of the crash begun, India’s South Eastern Railway company said on Saturday.