Oswiecim (Poland): Krystyna Gil was told by her Roma grandmother to "never forget”. Though she was just a child during World War II, when the Nazis began systematically exterminating Roma in her native Poland, she has done just that. "I was five years old at the time. I became an orphan. The love of a mother and a father, I do not know what that means," she told a news agency. Gil, now 76, was among more than a thousand who gathered today at the Auschwitz-Birkenau death camp in Poland to remember the genocide of Roma people carried out by the Nazis. The ceremony was held on the 70th anniversary of one of the worst mass killings of Roma, when nearly 3,000, many of them children, were taken to the gas chambers at Auschwitz on the night of August 2, 1944. "We join together here in pain, in memory of the victims," said Roman Kwiatkowski, head of the Association of Roma in Poland. "Here we consolidate as a people, not only in relation to our past but also our future," he said at the ceremony, held on the occasion of the International Day of Remembrance for the Holocaust of the Roma. Around a thousand also marched through Budapest to mark the date. Many of those killed at Auschwitz came from Hungary, where Roma make up between five and eight percent of the country`s population of 10 million. Together with her grandmother, Gil was the only member of her family to survive an anti-Roma pogrom in Szczurowa, a small village in south-eastern Poland, in 1943. Many others did not survive. Between 220,000 and 500,000 Roma were murdered by the Nazis, a tragedy the community refers to as "Pharrajimos", which means destruction in their language. Of that number, 21,000 met their end at Auschwitz-Birkenau after being forcibly deported from across Europe. "It is a genocide that has been forgotten by Europeans, and that should change," said Thomas Schobesberger, a 23-year-old Austrian who had travelled from Vienna for the ceremony.