Authorities have warned heavy fuel oil spilt in Tauranga Harbour earlier today could come ashore on beaches, as rain and high winds hamper a clean-up effort.
The spill occurred earlier today as a ship was bunkering at the Port of Tauranga.
An oil slick was spotted by Tauranga Bridge Marina staff, who contacted Bay of Plenty Regional Council's Pollution Hotline and the Port of Tauranga.
Adrian Heays, the regional council's oil spill on scene commander, said severe weather was hampering oil retrieval, with some booms proving ineffective in the high winds and heavy seas.
It is believed an oil line on a berthed ship had leaked and oil spilled near berths further along.