A popular fitness center in central Auckland has been temporarily shut due to a building threat.

CityFitness gym sent an email to its customers advising them its Queen Street branch had been temporarily closed due to a building threat.

"There was a building threat that needs police clearing before we can reopen to ensure the safety of the public," the email read.

It said the check was not expected to take long.

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Police said it was too soon to comment on the matter.