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This was one of six death camps they built in occupied Poland in 1942, and it was by far the biggest.

"Treblinka-2 was a death camp where a large number of people were killed in gas chambers," she says, without specifying that most of the victims had been Jews.

Birkenau was to become the biggest of six Nazi death camps.

Later, the scene will move to the death camp at Birkenau, known as Auschwitz II.

She has written a book about her experiences and, alongside working as a child psychiatrist, she speaks often about the death camps and antisemitism, to audiences at home and abroad.