In the book, The Boy in the Striped Pajamas, how does Bruno die?

Question: In the book, The Boy in the Striped Pajamas, how does Bruno die!?
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Just before Bruno's family is about to leave Auschwitz,as a final adventure, he agrees to dress in a set of striped pyjamas and climb under a loose wire in the fence to help Shmuel find his father, who has gone missing in the camp!.They are unable to find him, and just as it starts to rain and Bruno decides he would like to go home, the people in the area of the camp which the boys are in must go on a 'march'!. Neither boy knows where this march will lead!. However, they are crowded into a gas chamber!.this is where bruno's story ends!.The gas chambers were used during the world war 2 by hitler to commit mass murder!.the main victims were jews most of the time!.But here bcoz Bruno is wearing those striped pajamas he is taken for a boy from the camp and is led to those gas chambers by the guarding soldiers!.Www@QuestionHome@Com

he is gassed with zyklon b in the phony shower room with his jewish friend!.Www@QuestionHome@Com