The category four storm caused widespread flooding and damage to homes across the country.
With the full extent of the damage yet to be determined, authorities are urging the public to remain indoors until given the all-clear.
Misa Funaki, of the Fiji Meteorological Service, said communication networks were down in the outer islands, including Kadavu, which felt the brunt of Harold.
"Reports are coming in on the devastation caused by Harold - not only on the main island of Viti Levu but moreso in the maritime islands of the Lomaiviti and Lau groups," he said.
