Fijian people exhausted following floods -- Unicef

Police in Nadi assist an injured man (Fiji Government / Facebook).
Police in Nadi assist an injured man (Fiji Government / Facebook).

Unicef is warning the latest flooding in Fiji is a big step back for the island nation.

Thousands have been forced back into evacuation centres only weeks after the devastating Cyclone Winston.

Unicef spokesperson Karen Allen says the Fijian people are exhausted and demoralised. Ms Allen says newly sown crops have been swept away and there are concerns the floodwater could spread disease.

"Maybe [it's] not back to square one but it's definitely a step back," says Ms Allen.

Fijian police have also confirmed they are searching for a 19-year-old girl swept away near Nadi. It's believed she was trying to cross a river on her way home from school when she was carried away by strong currents.

The latest flooding follows mass destruction caused by Cyclone Winston in February, when entire villages were wiped out.

More than 1500 people are still in evacuation centres following Cyclone Winston. Tens of thousands have yet to rebuild their homes and are living in makeshift shelters.

Unicef says another 3500 people have been forced to return to evacuation centres to escape floodwaters.

Rains have eased today, but warnings are still out that torrential rain will return tonight.

There is a chance that three separate tropical depressions could converge to form a category one storm, which may also affect Vanuatu, Solomon Islands and Tonga.