Tonga Police are looking for a missing disaster and emergency siren belonging to the National Emergency Management Office (NEMO) that was installed at the Tonga Communications Company (TCC) mast at Kolovai.
The siren donated by Japan was installed at the TCC mast, 25 metres from the ground.
The Director of NEMO, Leveni 'Aho said such crime was not carried out by one person, because it will take time to climb up the mast and steal the siren.
Police say it is believed the siren was stolen to be used as amplifier in a vehicle.
Radio Tonga reports the siren is part of an early warning system trial programme to warn the public of any natural disaster such as a tsunami.
Aho said Tonga could lose funding support from donors because of such behaviour.
The western district is a low lying area and if a tsunami hit without the warning system the impacts and damage will be massive....