Armoured police cars are patrolling the streets of Rio de Janeiro after a fourth day of gang-related violence.
13 suspected drug traffickers have been killed in clashes with the authorities. 25 people have been arrested.
The attacks broke out on Sunday, on the orders, so officials say, of jailed gang bosses.
Alleged gang members set fire to cars and buses after forcing their occupants out.
Gunmen also opened fire on a police station.
Rio is best known for its beaches and easy-going tropical lifestyle.
But violent crime like this has raised questions about the city’s suitability to safely host the 2014 World Cup and 2016 Olympics.