Shocking violence at a Brazilian championship match this weekend is not an indication of what can be expected when the South American country hosts the World Cup next year, said FIFA, the international governing body of soccer, on Monday.
At least 30 people have been killed in incidents in and around Brazil's stadiums this year, one expert said, after three people were seriously injured when fans fought running battles at the Atletico Paranaense versus Vasco da Gama match.
Sunday's game on the final day of the season had to be halted for 70 minutes. Some players broke down in tears as they watched fans chase each other round the terraces, trading blows and hitting each other with homemade sticks and weapons.
"For a country that is hosting the World Cup next year this is very sad," said Alessandro, the Vasco goalkeeper. "The stadium isn't safe. From what we can see the fans aren't segregated."
A police helicopter landed on the pitch to ferry one unconscious fan to a hospital. The game was eventually restarted and Atletico won 5-1, relegating Vasco to the second division.
The fighting brought back memories of the blackest days of European soccer in the 1980s and it was another graphic sign that soccer violence is worsening in Brazil.
"Something has changed, and for the worse," said Mauricio Murad, a Rio de Janeiro sociologist who wrote the book How To Understand Football Violence. (Soccer is referred to as football outside the U.S.)
"Over the last five or six years, violence inside stadiums was under control, and it was only bad outside the grounds. What we've seen over the last few weekends is a return to violence inside the stadiums."
Brazil's Sports Ministry called for swift punishment for hooligans. In a statement, it said it would consult with public prosecutors and police chiefs over future policing of matches.
There were no police inside the Arena Joinville where the game took place Sunday because the home side had opted to use private security guards.
President Dilma Rousseff condemned the troublemakers and called for a special police station to be set up to deal with soccer-related incidents.
However, Murad said authorities have long known about the problem and had not taken any serious action. At least 30 people have been killed in and around stadiums this year in Brazil, seven more than last year, he said.
Murad blamed organized fan groups, many of whom are sponsored by clubs, for much of the trouble.
Lance, Brazil's best-selling sports newspaper, said 234 had been killed in soccer violence since 1988. The paper recently called the organized fan groups "gangsters dressed up as football fans" and blamed the authorities for not doing more.
The paper suggested police take simple steps such as making known hooligans report to police stations on match days, a tactic that was successful in England.
"The problem is not the lack of laws but the lack of commitment and rigor shown by authorities in upholding the laws that exist," the paper said in a front-page editorial in October after fans fought with police at the Sao Paulo match between Sao Paulo and Corinthians.
On Monday, the paper printed the colorful World Cup logo in black and white. The tournament will be held in South America next year for the first time since 1978.
FIFA was quick to tell fans they should not fear violence at next year's tournament that will be held in 12 new or totally modernized stadiums across the country.
Unlike Sunday's game, which was organized by local clubs under the auspices of the Brazilian Football Confederation, World Cup matches are organized by FIFA and will count on heavy security both inside and outside the stadium.
In addition, only eight percent of tickets for each match go directly to the fans of the teams involved.
"For the 2014 FIFA World Cup a very comprehensive security concept is in place in an integrated operation between private and public security authorities to ensure the safety for fans, players and any other stakeholder involved in the event," FIFA said in a statement.
"The concept has worked very well during the FIFA Confederations Cup and is built on models used at previous FIFA World Cups." The Confederations Cup took place in Brazil this year.
The worry for Brazilians is not just what will happen during the World Cup, but also what will happen afterward. Authorities say the new stadiums will produce a more sophisticated supporter who will watch the match in safer, more comfortable surroundings.
Yet some of the most depressing incidents this year took place in stadiums built for the World Cup. Fans from Vasco and Corinthians battled each other and police at the Mane Garrincha stadium in Brasilia in August, just three months after Brazil opened the Confederations Cup at the stadium.
"If things change, it is not because we have new stadiums but because we have policies in place designed to prevent, repress and educate," said Murad. "That's the only way that things are going to change."