Brazilian police say at least 16 people have been killed in a series of attacks on police stations and public buses in Rio de Janeiro.
Officials said gunmen stopped one bus on a highway in the city, robbed the passengers and then torched the vehicle. They said at least six bodies were found on the charred bus.
Gunmen also opened fire on several police posts and buildings, killing two policemen.
Police said the motive for the apparently coordinated overnight attacks was not immediately clear. Some officials said it may be linked to anti-drug efforts in the city.
Some 200 people in Sao Paulo died earlier this year in a series of attacks by criminal gangs.
Some information for this report was provided by AFP, AP and Reuters.