Fans invaded the pitch during a Junior Football Cup semi-final game between Sao Paulo and Palmeiras youth teams in Brazil.
Sao Paolo were 1-0 down in stoppage time when two home fans jumped over the barries and attacked the Palmeiras players.
One particular fan threw a knife onto the pitch. It flew inches away from Palmeiras players. The referee then picked the weapon.
San Paolo players tried to contain calm down the supporters, with one footballer even clashing with a fan.
The match was interrupted for six minutes because of the chaos on the pitch. Palmeiras ended up winning the game 1-0.
Police have launched an investigation into the fans who invaded the pitch and threw the knife.
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