From EFE, via Fox News:
Six presumed drug traffickers died Wednesday in a shootout with Brazilian police in the city of Niteroi in the Rio de Janeiro metropolitan area, authorities said.
The gun battle broke out after nightfall when the alleged drug gang members were approached by a police vehicle and opened fire, whereupon the officers inside an armored car fired back in self-defense.
During the ensuing shootout, six people were killed and one other was arrested, all of them presumably involved in drug trafficking and as yet unidentified, according to the Rio Civil Police.
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