River supporters hurled glass bottles and missiles at the bus as it made its way to the El Monumental stadium ahead of Saturday night's second leg, which had been due to kick-off at 8pm GMT.
Several windows were smashed with numerous Boca players suffering cuts from broken glass. Reports from local news outlets also claimed that some players were taken ill due to the effects of tear gas, used by police to help disperse the crowds.
Footage from inside the Boca dressing room subsequently showed a number of players appearing groggy and disorientated. Former Manchester City striker Carlos Tevez was pictured arriving at the stadium in a clearly distressed state.
Two Boca players, Pablo Perez and Gonzalo Lamardo, were sent to a local hospital as a result of their injuries.
Boca president Daniel Angelici immediately met with River counterpart Rodolfo D'Onofrio, as well as CONMEBOL chief Alejandro Dominguez, to discuss whether or the game could be played in such conditions.
CONMEBOL, the South American Football Confederation, then announced in a tweet that the final would be postponed by an hour to 18.00 local time (21.00GMT) as a result of the violence. However, this was later revised to 19.15 local time (22.15GMT).
The final is finely poised at 2-2 after the first leg two weeks ago.
Join our new commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies