Hamilton Airport has been evacuated.
The airport was about to do a standard fire drill but a lightbulb set off a sensor, and people had to leave the terminal earlier than expected.
Hamilton Airport chief executive officer Mark Morgan says there was no fire and everyone is safe.
He says about 20 staff and passengers had to leave the terminal but are expected to be allowed back in soon.
Morgan says no flights are affected.
Fire drill gets real at Hamilton Airport
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