BUENOS AIRES, Argentina (AP) — In one of the most violent episodes in recent South American football history, hooligans from Argentina’s Independiente and visiting Universidad de Chile attacked each other in the Copa Sudamericana.

The ferocity of the stadium fighting with sticks and sharp objects injured nearly 20 Chilean fans while local police chose to stand down. Two of the Chilean club fans were in critical condition.

The round-of-16 match on Wednesday was canceled, and CONMEBOL must decide the future of the tie.

How did the violence erupt?

According to a report from the Ministry of Security of the Buenos Aires province, it started among about 4,000 Universidad de Chile fans in an upper stand of Libertadores de América Stadium in the Buenos Aires district of Avellaneda. Some of t

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