In the latest case of soccer violence in the host country of the 2014 World Cup, a second-division match in Brazil was stopped when fans threw rocks and explosives on the field.
There were no reports of serious injuries in Friday's game between Avai and host Paysandu in the northern city of Belem. Police said some Paysandu fans were detained.
Television images showed one bomb thrown from the stands and exploding a few feet from police officers on the field. A few fans tried to break the fences separating them from the field. Police used pepper spray and batons against the fans in the stands.
Last week, seats were destroyed at a World Cup venue and police confronted fans inside two stadiums. Two matches were delayed two weeks ago because of fan fighting and overcrowded stands.
After Avai scored in the 75th minute to lead 2-0, fans turned violent. A few minutes later, the referee decided it was not safe to continue as police tried to restore order.
Paysandu fans began throwing rocks toward Avai reserve players just after the visitors scored in the 75th minute at Curuzu Stadium to make it 2-0. The reserve players ran onto the field to escape fans who were throwing things at them, prompting the referee to interrupt the match and call for police.