http://www.dailymail.co.uk/news/article-3099309/The-brain-heart-attacked-begins-stinging-chest-epileptic-seizures-Trial-Auschwitz-bookkeeper-told-gas-chamber-pesticide-weak-holocaust-victims-longer-half-hour-die.html The brain and heart are attacked first... It begins with a stinging chest and epileptic seizures': Trial of 'Auschwitz bookkeeper' told how gas chamber pesticide was so weak it could take holocaust victims 'longer than half-an-hour to die'

Oskar Groening is on trial for his role in deaths of 300,000 Hungarian Jews
Zyklon-B gas used by the Nazis to kill most of 1.2 million Holocaust victims
Court heard how pesticide causes extreme pain, violent seizures and kills anyone who inhales it from cardiac arrest 'within seconds'
But low concentration in gas chambers meant victims were in pain for 'longer than half an hour' before dying

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