The school was damaged in the earthquakes and required a total rebuild. It was part of the Christchurch Schools Rebuild Programme, which redeveloped 115 earthquake-damaged schools.
Fire and Emergency senior adviser Wayne Hamilton told the public to contact police on 105 if they have any information on either fire.
“This is a timely reminder for any building sites to make sure combustibles and other items are safe and secure,” Hamilton told the Herald.
“[These sites] should consider putting security systems in place such as lighting systems and alarms.”
Police said there was a third fire on Ilam Rd between 2am and 5.20am.
A police spokesperson said no buildings were involved and nobody reported any injuries as a result of the blazes.
“Inquiries are ongoing.”
Additional reporting from the Otago Daily Times