The final of the competition, South America's equivalent of Europe's Champions League, was rescheduled for Sunday at 5 p.m. local time (2000 GMT). Video subsequently released by the club showed at least five smashed windows.
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. Forensics experts were seen swabbing the bus, presumably to determine the origin of the gas.
Boca's captain was left with glass in his eye after the bus attack.
Trouble continued after the incident with the bus. "The police were overwhelmed by all the vandalism and had to disperse the River fans with tear gas", said the unnamed official.
Footage also emerged of the Boca bus approaching the stadium at high speed, trying to avoid the barrage from the River Plate fans.
Boca's Pablo Perez suffered injuries to his arm and eye and could not take part in the game. Perez was included in the starting lineup. They are forcing us to play the game.
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Former Manchester United striker Carlos Tevez, who was among the injured Boca players, reportedly said: "We are not in condition to play". "But the truth is we're not in condition to play". "As for me, I had a lot of pain in my throat and just now it was giving me a headache".
Second, physical injury was suffered by at least two Boca players as a effect of splinters of glass from the broken windows.
Some reports said Argentine police fired tear gas at River fans who were throwing missiles at the Boca bus and the gas got into the vehicle while others reported that the damage was caused by River fans.
Violence has long dogged Argentinian football, the dark underside to the color that so attracts foreign audiences. CONMEBOL president Alejandro Dominguez also mentioned illustrious guests, such as Federation Internationale de Football Association president Gianni Infantino.
The all-Buenos Aires clash, the first time Argentina's two biggest clubs had met for the title, was billed as the greatest final in the competition's 58-year history but will instead be remembered for the violence that left players bleeding and nearly all the windows on one side of the Boca bus shattered. It will not be played behind closed doors, which raises the prospect of angry Boca fans making for the stadium to take their revenge.