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Bond St was cordoned off and firefighters with breathing apparatus entered both buildings.
A person at the scene said there was a smell of gas throughout the buildings.
The cordon was lifted in the early afternoon and occupants re-entered the buildings.
Fire crews found no evidence of a dangerous gas leak.
A Fire and Emergency New Zealand staff member contacted the Harbourmaster regarding the possibility an lpg tanker had released gas when leaving the dock, but a Port Otago spokesman said there was no evidence this was the case.