Plaster has been poured into the Marcal river in a bid to bind the sludge and stop further flooding.

BBC: 'One year' to clean toxic spill in Hungary

Gypsum was being dropped into the Marcal river from helicopters to neutralise it.

BBC: Hungary sludge death toll rises after two bodies found

All life in the Marcal river, which feeds the Danube, has been "extinguished".

BBC: Hungary sludge death toll rises after two bodies found

"The Marcal river is dead, " said Tibor Dobson, spokesman of the Hungarian Disaster Management Agency - a reference to a smaller river which flows north from the disaster area towards the Danube.

BBC: Toxic sludge carpets homes in Hungary