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The first people to be gassed were a group of Polish and Soviet prisoners in September 1941.

Soon trains would arrive at Birkenau at a specially constructed ramp, a short distance away from two gas chambers, and at one point 12,000 Jews were being gassed and their bodies burned every day.

Being forcibly tattooed was part of the "process" for every prisoner arriving at Auschwitz who wasn't immediately gassed to death and instead was selected for forced labour or medical experimentation.

Inside hot barns, they caught infected birds, gassed them with carbon dioxide, and disposed of the carcasses.

After a half century of Assad family dictatorial rule, Bashar Assad has fled and Syrians can finally celebrate the end of a horrific regime that gassed, starved and murdered its own people.