Firefighters try to contain toxic gases with water at a plant of Kraft Foods in Bad Fallingbostel, northern Germany, on October 16, 2012. Catastrophe alarm was sparked out when a tank of sodium hydroxide solution was by mistake filled with nitric acid, producing a poisonous cloud of nitrous gases. Around 1,500 people have been evacuated from their homes, after the chemical accident at the factory. AFP PHOTO / INGO WAGNER GERMANY OUT