How many people were killed by firing squads during the holocaust?

About 2 million half of which were not Jewish.

Similar numbers of Chinese and Asian people were subjected to experimentation by Germanys ally Japan but no action was taken in a deal that gave the USA the results gained from these crimes.

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No, the number of Holocaust victims killed by medical experiments is usually given as about 18,000. It is a big mistake to think of it as a major method of killing in the Holocaust.