where he had played during his time with Monaco and stated, "It was one of the most intense atmospheres I've ever experienced in a stadium, so I expect it will be a bit like hell for us. Their supporters really can help their team." Former Paris Saint-Germain superstar striker Zlatan Ibrahimović spoke of his admiration for Olympiacos supporters after an Olympiacos–Paris Saint-Germain match on 17 September 2013: "They played in front of their fantastic public. Olympiacos supporters were amazing. My friend Olof Mellberg played here and he talked to me about the supporters. I never saw it live, but now I understand. It's amazing. It's a big advantage for Olympiacos." PSG billionaire owner Nasser Al-Khelaifi stated, "I have big respect for the fans here. I've never seen fans like Olympiacos' fans in my life." PSG and Brazil international winger Lucas Moura in an interview with goal.com stated that Olympiacos home ground was the most intense and heated stadium he's ever played in. The Gate 7 tragedy The history of the Karaiskakis Stadium and Olympiacos was marked by the worst tragedy that ever hit Greek sports, known as the Karaiskakis Stadium disaster. On 8 February 1981, Olympiacos hosted AEK Athens for a league match, which ended 6–0, in an unprecedented triumph for the host team of Piraeus. During the last minutes of the game, thousands of Olympiacos fans at the Gate 7 rushed to the exit, to get to the stadium's main entrance and celebrate with the players, but the doors were almost closed and the turnstiles still in place, making the exit almost impossible. As people continued to come down from the stands, unable to see what happened, the stairs of Gate 7 became a death trap; people were crushed, tens of fans were seriously injured and twenty-one young people died, most of them by suffocation. In memory of this event, every year on 8 February, there is a memorial service at the stadium in honour of the supporters that died in that incident. The service is attended by thousands of fans every year, who are rhythmically shouting the phrase, "Αδέρφια, ζείτε, εσείς μας οδηγείτε." (Adhélfia, zíte, esís mas odhiyíte, "Brothers, you live, you are the ones who guide us."). At the tribune part of the stadium where Gate 7 is now, some seats are colored black instead of red, shaping the number "7", whereas there is also a monument