Emergency workers are trying to stem the flow of burning red sludge that has engulfed three villages.<br /><br />More than 100 people have been injured, suffering from burns and eye irritation caused by the lead and other highly corrosive elements contained in the sludge.<br /><br />The spill is streaming from a burst waste reservoir at an aluminium plant and there are fears it may reach the river Danube, one of Europe's main waterways. <br /><br />Al Jazeera's Zeina Awad reports.
