A woman surveys the damage in Devecser, Hungary after the village was flooded by toxic red sludge from a local aluminium plant.

Four people, including two children, were killed after a reservoir broke and flooded three villages in western Hungary with toxic red mud, officials said Tuesday.

The government has declared a state of emergency in three counties, the State Secretariat of Governmental Communications said.

The National Catastrophe Protection Directorate (OKF) said the two children who died were 1 and 3 years old. A 35-year-old man was killed in his car, and a woman was killed in her home, the government said.

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