Hundreds of Auckland shoppers can return to their retail therapy, after earlier being evacuated from Newmarket's Westfield mall.

A triggered fire alarm led to the recently reopened mega-mall's evacuation this afternoon, calling Fire and Emergency New Zealand (FENZ) to the site around 3.45pm.

FENZ shift commander Dan Reilly said a pressure drop in the system due to a lack of water triggered mall's alarm and sprinkler system.

The sprinkler system might cause a bit of flooding in the country's biggest shopping centre, he said.

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FENZ left the Westfield mall around half an hour ago, he said.

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