The decisive second leg of the Copa Libertadores final between River Plate and Boca Juniors was delayed for more than two hours on Saturday after Boca players were hurt when their bus was attacked on its way into the stadium, organisers said.

 "In order to comply with the final's chronogram, the game will now start at 19:15," (2215 GMT) the South American Football Confederation (CONMEBOL) said.

The mach had previously been put back an hour from its original 17:00 kick-off (2000 GMT).

The delays came after a chaotic afternoon outside the Monumental stadium in the Argentine capital.

Some reports said police fired tear gas at River fans who were throwing missiles at the Boca bus and the gas got into the vehicle and affected the players.

Others reported that the damage was caused by River fans.

"They were throwing pepper gas, stones, everything," Clarin website quoted Juan Carlos Crespi, a member of the Boca delegation, as saying.

Boca officials told reporters some of their players were not fit to play in the match and that captain Pablo Perez was taken to hospital after being cut by shards of glass.

"The players are all hurt, you can't play this way," Christian Gribaudo, Boca's secretary general, said.

Clarin said six players had vomited in the dressing-room after ingesting the toxic substance.

Boca and River drew the first leg 2-2 on Nov. 11.

The first delay was decided barely an hour before the kick- off and in the presence of FIFA President Gianni Infantino, who travelled to Buenos Aires to watch the game.

The match marked the first time Argentina's two biggest clubs have met in the final of the Libertadores, South America's equivalent of the Champions League, and it was widely billed as the greatest final in the competition's 58-year history.

Earlier in this season's competition, River Plate coach Marcelo Gallardo brazenly flaunted a decision banning him from the dressing-room in the semi-final second leg against Brazilian club Gremio.

Gallardo was given another ban but River, who scored twice after the coach's intervention to qualify on away goals, were allowed to progress into the final.

Saturday's incident occurred three years after a Libertadores last-16 tie between the same teams was abandoned at halftime after Boca fans attacked the River players with pepper spray in the tunnel.

River were given a bye into the quarter-finals and Boca were kicked out the competition.

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