An armed man is holding a number of passengers hostage on a commuter bus in the Brazilian city of Rio de Janeiro.

Footage shot from a helicopter shows the bus stopped across two lanes on the bridge connection Rio with the city of Niterói.

Military police officers, ambulances and a special operations team are at the scene.

At least five passengers have been freed. More than a dozen are still believed to be on board.

Brazilian media say it is not clear if the armed man has made any demands. He reportedly boarded the bus at 05:30 (0830 GMT) and threatened passengers.

One news site has released a WhatsApp message reportedly written by one of the passengers, saying that the gunman has tied the passengers’ hands and has a petrol can as well as a gun.

Traffic on the bridge has been blocked completely.

Police say they are speaking to the hijacker.

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