One person has died after a multi-vehicle crash on the Sydney Harbour Bridge.
Police found three cars and a bus had collided about 1:40pm.
One man died at the scene and a second is in a critical condition.
NSW Ambulance paramedics are assessing a number of other patients, a NSW Police statement said.
The multi-vehicle crash on the Sydney Harbour Bridge closed all lanes of traffic. (ABC News)
Police said the bus driver was uninjured and there were no passengers on board at the time.
All southbound lanes are closed and only one northbound lane is open.
The Sydney Harbour Tunnel remains open, but traffic is very heavy so motorists are advised to use an alternative route if possible.
Buses which normally cross the Harbour Bridge are starting and finishing trips at North Sydney and Macquarie Park.
Emergency services, the Crash Investigation Unit and Transport for NSW are all at the scene.
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