A footprint is seen in the mud after red toxic sludge flooded the village of Devecser, 150 km (93 miles) west of Budapest, October 11, 2010. A million cubic metres of red mud burst out of a sludge reservoir last Monday, flooding three local villages and fouling rivers including a tributary of the Danube. The town of Devecser, home to 5,400 people, is on alert should it need to be evacuated. REUTERS/Bernadett Szabo (HUNGARY - Tags: DISASTER ENVIRONMENT IMAGES OF THE DAY)