Heavy rain is the suspected cause for the evacuation of one of Rotorua's isolation facilities on Monday night.
At 6.46pm a fire alarm went off at the Sudima Rotorua managed isolation facility, a managed isolation and quarantine spokeswoman said.
Fire and Emergency NZ responded.
"Those inside the affected block of the facility were safely evacuated as per fire evacuation processes," the spokeswoman said.
"FENZ have advised the cause was a false alarm; possibly caused by heavy rainfall."