Rescue services say a third person has died in flooding caused by the rupture of a red sludge reservoir at an alumina plant in western Hungary. Six people are still missing and 120 were injured.
The National Disaster Management Directorate says Tuesday that several hundred tons of plaster are being poured into the Marcal river to bind the toxic sludge and prevent it from flowing on.
Monday's spill of an estimated 600,000-700,000 cubic meters (21 million to 24 million cubic feet) of sludge has affected seven towns near the Ajkai Timfoldgyar plant in the town of Ajka, 100 miles (160 kilometers) southwest of Budapest, the capital.
Officials say the sludge, a waste product in aluminum production, contains heavy metals and is toxic if ingested. Many of the injured suffered burns.