Thousands of people are being evacuated downstream of a major dam that 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. Please subscribe here: http://bit.ly/1rbfUog #Ukraine #Russia #BBCNews