An anti-Israel group vows to continue protesting against a naval weapons expo despite violent clashes with police, 13 arrests and a suspected broken leg.

Hundreds of people rallied at Darling Harbour in Sydney on Tuesday to protest against the Indo Pacific International Maritime Exposition, a three-day event billed as the nation's premier commercial maritime and naval defence forum.

Exhibitors include Israeli weapons manufacturers and other firms supplying the nation's military.

An attempted blockade of the biennial event escalated tensions with police as the conflict ebbed and flowed in the five-hour protest.

Palestine Action Group organiser Josh Lees was denied the opportunity to ask police a question at a press conference after the event.

NSW Police Superintendent Paul Dunstan told

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