Warsaw - Survivors of the Majdanek Nazi death camp were among the several hundred people who attended ceremonies Monday to mark the 60th anniversary of the mass killing of some 18,000 Jewish captives of former camp in Lublin, eastern Poland, a Majdanek state museum official confirmed.

A special plaque dedicated to the memory of Jews who perished November 3, 1943 at Majdanek as well as an estimated 10,000 others killed at the Trawniki camp two days later was unveiled at the former Majdanek camp during Monday's ceremonies.

The November 1943 mass executions at Majdanek and Trawniki were part of a plan code-named "Harvest Festival" by the Nazis and marked the culmination of the larger operation "Reinhard.”

The Nazi plan was aimed at killing the approximately 2.2 million Jews living in the Nazi-administered General Government in occupied Poland in 1942-43 and was named after top Nazi officer Reinhard Heydrich in charge of the so-called "Final Solution" to kill all European Jews.

Historians estimate that the Majdanek camp claimed between 250,000 and 360,000 victims. Second only to the notorious Auschwitz, Majdanek was among the largest Nazi German death camps in the occupied Europe.

It was opened on the outskirts of the eastern Polish city of Lublin in October 1941 and evacuated in July 1944 before advancing Soviet troops.