Police choppers are in the air this morning, while officers on motorcycles are patrolling the main business thoroughfares, which have been closed to traffic.
Steel fencing lines St Georges and Adelaide Terraces ready for the motorcades carrying the Queen and dignitaries to the CHOGM venue, at the Perth Convention and Exhibition Centre.
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A big protest march is planned from 11am (WST), with demonstrators planning to stage a sit-in at an intersection near the venue.
The Queen will officially open the three-day meeting at a ceremony starting at 10am.
Click here for full coverage of CHOGM.
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