The Hungarian government has arrested the CEO of the chemical company it says is responsible for the worst chemical accident in Hungary’s history. At least seven people have been killed and 150 have been wounded since toxic sludge from an alumina plant flooded several towns last week. Over 21 million cubic feet of sludge leaked from the plant’s reservoir, engulfing homes and roads. Hungarian Prime Minister Viktor Orbán said the company, MAL Zrt, had ignored safety hazards.

Hungarian Prime Minister Viktor Orbán: “In light of what happened, we have good reason to believe that there were people who were aware of the dangerously weakened state of the walls of the reservoirs, but driven by their private interests, they believed they were not worth repairing and hoped that the trouble could be avoided.”