Reigning champions River Plate qualified for the final of the Copa Libertadores on Tuesday night but not before the second leg of the semi with arch rivals Boca Juniors had been delayed by bundles of ticker tape on the pitch.
The match, which came less than a year after violence interrupted the final between the same two clubs, was pushed back by 15 minutes for a big clean-up operation.
Reigning champions River Plate booked their place in the final with a 2-1 aggregate win despite losing the second leg 1-0 and surviving a late onslaught by Boca.
River won the first leg of the semi-final 2-0 at their earlier this month and were on the back foot for large parts of the match but it was not until the last few minutes that Boca threatened their two-goal lead.
Substitute Jan Hurtado got on the end of Lisandro Lopez's commanding header with just 10 minutes left but the home side could not find the all-important equaliser.
Last year the second leg of the final was postponed - and eventually moved to Spain - after River fans attacked the Boca coach as it approached River Plate's Monumental stadium.
In 2015 Boca were kicked out of the competition after their fans attacked the River players with pepper spray in the tunnel at half time of their last 16 tie.
Tuesday's result means the final will pit River against either Flamengo or Gremio in Chile on November 23.
The two Brazilian sides meet on Wednesday's second leg in Rio, with the tie level at 1-1 after the first leg in Porto Alegre.
