The Department of Corrections office building in Dunedin was closed for several hours after a suspicious package was found.
A police spokeswoman said the package was reported to them about 10.15am on Thursday.
The building, including a retail premises on the ground floor, was evacuated as a precaution.
At 8pm, police revealed the package had been examined by the New Zealand Defence Force Explosive Ordnance Disposal Team and was found to contain items that were not of any concern.
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"The cordons have been stood down and the building released back to occupiers," a spokesperson said.
An investigation into the circumstances of this incident is ongoing.