Police are vowing to arrest or charge pro-Palestine protesters if they unlawfully block traffic on a major city bridge after a magistrate denied legal protection for a proposed march.

Chief Magistrate Janelle Brassington ruled that Sunday's planned march by up to 10,000 people across Brisbane's Story Bridge would be declared an unauthorised protest.

"I'm satisfied (Queensland Police Service) has established there is a real and significant risk to persons in this case given the proposed route," she said on Thursday.

[Justice for Palestine rally organiser Remah Naji][Justice for Palestine rally organiser Remah Naji] Rally organisers were considering their options, Justice for Palestine's Remah Naji said. (Darren England/AAP PHOTOS) Ms Brassington said the planned protest was not unlawful

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