The cause of an oil leak that sparked a fire along Auckland's waterfront this morning and attracted a large emergency response is being investigated.
Seven Fire Service appliances were called to the Tank Farm at Wynyard Quarter about 10.40am after an automated alarm was activated, said Fire Service spokesman Jaron Phillips.
Mr Phillips said oil had leaked from a bitumen pipe line and caught fire in the bulk liquid storage facility, Marstel Terminals.
"It was extinguished but flared up, so we are standing by in case it flares up again," he said.
"It has the potential to [reignite] so that's why it attracts this response."