Boca Juniors' bus was attacked by River Plate supporters ahead of the Copa Libertadores final first leg in some very ugly scenes.
For the first time ever, the Superclasico, the biggest game in Argentine football history, is taking place in the Copa Libertadores final across two legs.
The two clubs have a huge disdain for one another and River fans want to great lengths to disturb the visitors upon their arrival at El Monumental this evening.
Reports say that they hurled stones to smash the windows and sprayed pepper gas at the bus driving the Boca squad and staff to the stadium, with Carlos Tevez one of the players most affected by the attack.
It's been said that several other members of the Boca squad have been caught up in the violent melee and were vomiting, as well as the driver allegedly passing out.
At the time of writing, there's no official word on whether CONMEBOL have decided to delay kick-off though they are believed to be holding discussions.
There is, however, plenty of talk that the game could end up being played behind closed doors in the middle of the week, which would be hugely disappointing.
The game will go ahead with kick-off delayed by one hour.