Security cameras showed numerous patrons sitting at the bar’s outside tables Saturday night when two armed men approached and opened fire.
Authorities are investigating the attack as a “possible conflict between criminal factions,” said Helber Barbalho, governor of Pará state.
In less than two weeks, at least 12 murders were recorded in Altamira, including the last attackaccording to local media.
The authorities want to clarify if the crimes are related.
Barbalho, who visited the city of 117,000 on Sunday, said he had mobilized a team of 50 officers to investigate.
Pará has been the scene in the past of wars between rival drug gangs and similar militias a the Mafia.