PORTO ALEGRE, Brazil - An Argentine fan in Brazil for the World Cup was shot in the leg during a bar fight over rival soccer clubs, security officials said on Wednesday, heightening concerns about possible violence if Argentina meets Brazil in the tournament's final match.

More than 100,000 Argentines flooded across the border ahead of their national team's Wednesday game in Porto Alegre, the southernmost city hosting World Cup games, prompting increased security measures focused on Argentina's notorious hooligans.

Brazil has already stopped more than 30 Argentines from entering the country due to their involvement with the violent "barras bravas" in their national soccer league.

The Argentine fan shot in the Porto Alegre bar fight did not suffer serious injury, and he was treated at an emergency room during Wednesday's pre-dawn hours, according to a public security spokesman.

Argentina's state news agency, Telam, identified the injured fan as 35-year-old Gonzalo Nunez.