Champions League viewers were left stunned on Tuesday night as a PSG fan with a megaphone stood behind the goal where the dramatic penalty shootout took place. Liverpool fans couldn't believe what they were seeing and hearing as the fan proceeded to let off a loud siren noise and continually shout throughout the shootout to put off Liverpool players. The noise could clearly be heard on Amazon Prime Video's coverage of the match, with many left confused and bewildered as Anfield stewards stood by and did nothing. One viewer said on social media: "How on Earth did someone get into a stadium and be allowed to make that noise behind the goal with a megaphone?" Another added: "I've worked in that stadium, why was the PSG fan with the megaphone allowed to belt it before every penalty? That at least gets confiscated, at worst gets you kicked out the stadium." Others seemed impressed with audacity of it all. One said: “Kudos to the PSG fan with a megaphone behind the goal playing the siren noise.” Liverpool crashed out of the competition after losing 4-1 on penalties following a 1-0 defeat at Anfield on the night. Leading 1-0 from the first leg, albeit against the odds after being dominated, they quickly found themselves pegged back by Ousmane Dembele’s 12th-minute goal at Anfield. Manager Arne Slot said it was difficult to separate the two teams after 90 minutes and while he accepted the Ligue 1 champions edged extra time the 4-1 defeat on penalties, with Gianluigi Donnarumma saving from Darwin Nunez and Curtis Jones, still felt harsh. “Of course it is shock,” he said. “It is maybe not the moment to tell them now but two seasons ago we went out to Real (Madrid) after losing 5-2 at home so if you have to go out, go out the way we did against one of the best teams in Europe and making such a fight. “I hope every fan around the world was hoping this game wouldn’t stop because it was incredible. “Two teams had an incredible level and intensity in the first 25 minutes. I also remember the first 25 against Manchester City and Real Madrid but this was unbelievable what we showed in the first 25. “Over 90 minutes I don’t think we deserved to lose, over 180 maybe it was deserved we went to extra time. “In extra time I thought maybe PSG was better than us. Then it comes down to penalties and they scored four.”