A plastic spill into the Whakatāne River is being investigated by the Bay of Plenty Regional Council.
The discharge of plastic particles into the river last week was accompanied by a strong sulphur-like smell which the council has tracked to at least three potential sources in the area.
Compliance manager Stephen Mellor said the council first received a call about the plastic discharge via its Pollution Hotline on Tuesday afternoon.
The council's compliance and maritime staff alongside the Whakatane District Council worked until Friday afternoon to clean up the plastic particles and are continuing to monitor the area.