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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