The Copa Libertadores final second leg has been postponed for an hour and still faces suspension after Boca Juniors' team bus was left almost destroyed and two players sent to hospital following an ambush by River Plate fans.
Tensions have been high around the Argentine capital Buenos Aires for weeks since it was confirmed that the two arch-rivals would meet in a two-legged decider.
Many, then, were relieved when the opening clash, a 2-2 draw in Boca's Bombonera, passed off relatively without incident, despite a 24-hour delay due to rain.
Editors' Picks
When Boca's squad made their way to the Monumental for the return match on Saturday, however, all hell broke loose.