VIENNA (AFP)---About 10,000 people including Austrian President Heinz Fischer gathered Sunday in Vienna to commemorate the 67th anniversary of the liberation of the Mauthausen concentration camp.   

People came from around the world to pay homage to the many tens of thousands of victims of the camp, which the Nazis built in Upper Austria near the city of Linz during World War II.   

Though Mauthausen wasn't an extermination camp in the same way Auschwitz, Treblinka and other facilities in Poland were, some 15,000 Jews and hundreds of Roma were killed there.   

Many more inmates were worked to death or died of starvation.   

Holocaust researchers estimate 200,000 people were sent to Mauthausen and its satellite camps, and about half of them died there.