I have stood on the spot where mothers disembarked the train with their children, outside the doors of the gas chambers.

They were asked which of their children were aged over 14 - a mother's first instinct was to keep all her children together, so that she could look after them.

She would tell the guards that children as old as 15, 16 and even 17, were under 14.

All children under 14 went straight from the train in through the doors of the chamber. In an attempt to protect their children, some mothers were committing them to instant death.

It's getting very cold.