Hungary declares state of emergency in three counties

Hungary says it will take more than a year and cost tens of millions of dollars to clear up the damage caused by toxic sludge which burst from a reservoir.

Four people were killed by the debris which cut a swathe a kilometre wide, engulfing nearby villages.

Nearly 500 police officers and soldiers, including six emergency detection teams, have now been deployed.

Nick Thorpe reports from the town of Devecser.