Towards the end of this Champions League quarter-final match, there was a major altercation on the field between several players, which resulted in Felipe being sent out.

That was just the beginning, as you can see in this video clip of players and staff being separated in the tunnel following the game...

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City won the tie 1-0 on aggregate to advance to the semi-finals, but it was a tough test for them as Diego Simeone's energetic team gave it everything they had in Spain last night to earn their place in the last four.

The fact that this happened between elite professionals, though, is a tragedy because some of the players' emotions appeared to have taken control of their actions.