Multiple people have been arrested as a protest outside a weapons expo erupts into chaos, with demonstrators forcing their way through a police barrier.

Hundreds gathered at Sydney's Darling Harbour on Tuesday to protest the Indo Pacific International Maritime Exposition, a three-day event billed as the "premier forum connecting Australian and international defence, industry, government, academia, and technology leaders".

The protest, organised by the Palestine Action Group, grew during the early morning before police began deploying pepper spray about 8am in an attempt to break up the surging crowd.

Eight people were arrested by mid-morning as police struggled to hold the crowd back.

"Police will have a presence at the assemblies and will work with protesters to ensure there are no br

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