The spokesman said the fires are believed to have been deliberately lit and investigations into the case will continue today.
Fire chiefs are calling for caution as all of Canterbury prepares to shift to a restricted fire season.
A permit will be needed to light a fire outside.
It follows a spate of fires on or near the Port Hills over the past week.
Emergency services were called to a blaze on Galilee Lane at about 11.30am on Tuesday.
It got to the size of about four to six hectares.
There were four helicopters assisting with firefighting efforts.