Brazil's safety reputation ahead of the 2014 World Cup and 2016 Olympics suffered a new setback on Thursday when police threatened to shut down a stadium after fans were hurt in a stampede.
Seven people picked up minor injuries after fans poured forward to celebrate a goal in a Copa Libertadores match between Gremio and Liga de Quito of Ecuador at the Arena Gremio in Porto Alegre.
The fencing between the stands and the pitch gave way and the tie was held up for six minutes.
Although the brand-new stadium will not be used for either the World Cup or this year's Confederations Cup, the incident has raised more concerns over Brazil's safety standards, just days after 235 people died in a nightclub fire in Santa Maria.
"We could close the ground on a temporary basis," said police commander Kleber Rodrigues Goulart.
The crush happened in a section of the stadium where there are no seats, a factor which allows crowds to cascade down the terracing and towards the fencing.
"We do not want a tragedy," added Goulart. "We have always believed that this area should have seating. We don't want to see a tragedy occur which would corroborate our opinion."
Although overlooked for the World Cup, the Arena Gremio will host a friendly international between Brazil and France on June 8.
The Brazilian Football Confederation (CBF) said they were following the situation "with tranquility but without wanting to create a panic".
"More than ever, we are going to take all measures to gaurantee the security of spectators," said CBF president Jose Maria Marin.
The club said the incident was being investigated.
"It is an engineering problem which preoccupies us. We must discover what caused the problem. We have to have a ground that is 100 per cent safe and we will carry out a technical study," said Eduardo Antonini, of the Gremio Empreendimentos, which has organised the construction of the stadium.
Meanwhile, a 22-year-old fan was stabbed outside the stadium just after kick-off, GloboEsporte website reported.
The victim is not in serious danger but he remains in hospital.