Police surround a bus hijacked by armed bandits after an attempted robbery in Rio de Janeiro's downtown August 9, 2011. The armed bandits who tried to rob passengers on the city bus attempted to escape when the police, who were alerted by the driver, arrived. After a shootout with police, the robbers took 20 people hostage before they surrendered. At least four people were wounded in the incident, according to local media. REUTERS/Ricardo Moraes (BRAZIL - Tags: TRANSPORT CRIME LAW)