Eight Manchester United players lost their lives as a result of a plane crash at Munich Airport 55 years ago today.
As so often on these anniversaries, people have taken to Twitter to pay their respects to all 23 people that died that afternoon.
Find out what has been tweeted below:
"The thoughts of all at #LFC are with families of the victims of 1958 Munich air disaster. Some things are more important than football."
Liverpool Football Club
"Today we stand together and remember City goalkeeper Frank Swift and all the victims of the 1958 Munich air disaster, never forgotten."
Manchester City Football Club
"Remembrance for the #MunichDisaster / anniversary today 06/02/1958. #BusbyBabes" Man United defender Rio Ferdinand
"Today is the 55th anniversary of the Munich Air Disaster..those who were affected will never be forgotten."
Former Man United goalkeeper Mark Bosnich
"A very sad day in Manchester United's history.I'm sure every fan will have a thought for the players tragically lost at Munich #wellneverdie."
Former Man United full-back Chris Casper
Another former United player, Gary Neville, tweeted a video which can be viewed below.