Two people have been killed as rival sets of football supporters battled at a toll booth on a major highway, according to Argentine police.
Violence is common among football fans in Argentina
They died after a clash broke out between fans of River Plate and Newell's Old Boys on the road between Buenos Aires and Rosario near the town of Zarate.
One of the dead men was shot and the other was stabbed, police said.
The fans of River Plate, whose club are based in Buenos Aires, were heading to Rosario in a convoy of eight buses to watch their team play Rosario Central.
Six busloads of Newell's fans were travelling from Rosario to Buenos Aires to see their team take on Boca Juniors.
"There was a terrible situation which ended in deaths," a police inspector said.
Police said dozens of fans were injured and "hundreds" arrested in Sunday's incident.
Soccer violence is common Argentina and fatalities are not unknown.