An estimated 200 to 300 litres of lubricating oil has been spilt in Akaroa Harbour by the anchored Royal New Zealand Navy vessel HMNZS Te Kaha.

Environment Canterbury said it was notified of the incident immediately by the New Zealand Defence Force.

“We’re now working alongside them to monitor and support clean up efforts.”

Early estimates put the spill from the 118m long vessel at between 200 and 300 litres.

Authorities urged people to avoid the affected area if they see or smell oil.

Local resident Mark Robinson told 1News a visible oil slick was heading towards the Wainui side of the harbour.

In late January, a tourist boat ran aground near the mouth of Akaroa Harbour, resulting in 2240 litres of marine diesel fuel and 120 litres of other oils being leaked into the sea.

NZDF has been contacted for comment.