Guardian: Hungary today declared a state of emergency in three western counties after a dam holding back a vast reservoir of toxic red sludge, from an alumina plant, burst, killing four people and injuring 120 others in what officials said was an “ecological catastrophe”. An elderly woman, a young man and a three-year-old child died in the deluge and six others were reported missing. Two of the injured were in a serious condition. The sludge, which is waste produced during aluminium …