A massive steel and concrete security fence is being put up in Sydney in Australia, ahead of a big meeting of Asia-Pacific leaders
The fence is 5km long and 2.8m high and will protect the 21 leaders, including USA's President George W Bush, from planned rallies by thousands of protesters.
Some 5,000 police and troops have been put on patrols, as part of Australia's biggest security operation.
They are being backed by navy patrols around Sydney's harbour, and also fighter jets and helicopters.
The Sydney Opera - where the meeting is being held - and the surrounding area will be closed to visitors - so bad luck if you're there on holiday!
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