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Last Updated: Friday, 7 September 2007, 11:03 GMT 12:03 UK
In pictures: Fortress Sydney

Police patrolling Sydney harbour in a zodiac inflatable

Sydney is in the grips of an unprecedented security operation as the Australian city plays host to the Asia-Pacific Economic Co-operation forum.

Bush speaking at Apec summit

Twenty-one leaders from the Asia-Pacific region are in town for the summit.

Police patrolling in Sydney

A 5km (three-mile) barrier has been erected across the central business district, sealing off the summit venue.

Police on jet skis

Five-thousand police officers and troops are on patrol, on water as well as land.

Police helicopter flying by Intercontinental Hotel, Sydney

Police helicopters are on guard around the hotel where US President George W Bush is staying.

Police sniper on Sydney Opera House

Even the famous Sydney Opera House is bristling with snipers.

Woman jogging past police on boats

Many residents are trying to ignore the disruption and just get on with daily life.

Empty tables in Circular Quay cafe

But many have simply steered clear of the city centre. Here the normally bustling cafes of Circular Quay stand empty.

Climate change protesters

As expected the summit has drawn crowds of demonstrators, many of them campaigning for more action on climate change.

Protesters with blood on their hands

President George W Bush and the US involvement in Iraq have been singled out for particular attention.

Protesters showing their buttocks

With so many issues to flag up demonstrators have had to resort to eye-catching tactics to get their message across. Here a group stages a "Bums for Bush" protest.

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