Boca Juniors and Gimnasia y Esgrima spilled into the stadium and onto the pitch, authorities said. Police fired rubber bullets and tear gas outside the Carmelo Zerillo stadium in La Plata, about 50 kilometers (31 miles) south of Argentina's capital as they attempted to stop fans from pushing into the already crowded venue. The unrest continued inside, where shocked spectators were seen squeezing through fencing to escape the violence and get onto the field. "I can confirm that there is one person dead. This person died of cardiac arrest," said Sergio Berni, security minister of Buenos Aires province, where the Argentina league first division match took place.