Tonga Fire and Emergency Services said there were no causalities when the Teta Tours and Loni Theatre buildings caught fire.
The buildings, on Wellington Road, have been landmarks in the area for over 60 years.
Investigations into the cause of the fire are still ongoing and the Tonga Fire and Emergency Services has asked members of the public for information.
They have also warned that arson is a serious offence that maybe subject to imprisonment.
