The leak happened on Monday from a pipe operated by Mobil. The ship involved has not been named.

Mobil New Zealand public affairs manager Samantha Potts told the Bay of Plenty Times that a sheen was spotted during refuelling.

She added: "We immediately shut down our fueling operations at the wharf. We have identified the sheen was originating from a fuel pipe line, which was shut down straight away and is still currently shut down."

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