Three additional shopping centres are subject to new powers allowing SA Police to search people and remove them from sites.

From today, Colonnades Shopping Centre, Tea Tree Plaza Shopping Centre, Modbury Triangle and part of Adelaide's CBD have become Declared Public Precincts.

SAPOL Assistant Commissioner Narelle Kameniar said the announcement brought the number of precincts in metropolitan Adelaide to 11, after eight metropolitan shopping centres were declared last week.

The declaration allows police to use metal detectors to wand shoppers at random for knives and order a person to leave the centre for 24 hours.

"There are knives being brought into Rundle Mall as well as Rundle Street and into Hindley Street where there are a lot of retail precincts."

Assistant Commissioner Kameniar

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