Hungary has declared a state of emergency in three counties after toxic sludge from an alumina plant flooded several towns. Over 35 million cubic feet of sludge leaked from the plant’s reservoir, engulfing homes and roads. At least four people have been killed, and 120 have been wounded. Hungarian Prime Minister Viktor Orbán said he’s ordered a probe into the disaster.

Viktor Orbán: “We do not know of any sign which indicates that this disaster would have natural causes. And if a disaster has no natural causes, then it can be considered a disaster caused by people. Everyone in this country wants to know who is accountable for this tragedy and the property damage.”