About 2,500 police officers and military personnel have raided a suburb of Brazil's second largest city, Rio de Janeiro.
Armed security forces, wearing camouflage uniforms, swept through Niteroi, a crime hot spot in east Rio.
Violence has been on the rise in Rio since the end of the Olympics nearly a year ago, with violent gangs operating in the city's favelas.
More than 90 police officers have been killed in Rio state so far this year.
Last month the government deployed more than 10,000 soldiers and police to fight organised crime in Rio.