Soldiers in chemical protection gear have been cleaning streets in the town of Devecser Western Hungary has declared an emergency after a sludge escape from an alumina plant killed three people and injured 120.
Red chemical sludge which flooded the area around the village of Kolontar from a burst dam stood 2m (6.5ft) deep in the nearby town of Devecser.
The sludge is said to contain caustic material and to be toxic if ingested.
Some 600,000-700,000 cu m (21m-24m cu ft) of sludge escaped from the plant, 160km (100m) from Budapest.
The state of emergency was declared in three counties – Veszprem, Gyor-Moson-Sopron and Vas.
Troops in protective gear have been helping to clean up the spill while plaster is reportedly being poured into the Marcal river to bind the sludge and stop further flooding.
Tamas Toldi, mayor of Devecser, told MTI news agency that between 80 and 90 people had been taken to hospital with chemical burns.
Burns caused by the sludge could take days to reveal themselves and what might seem like superficial injuries could later cause damage to deeper tissue, Peter Jakabos, a doctor on duty at a hospital in Gyor where several of the injured were taken, said on state TV.
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