A woman has died after falling overboard and suffering critical injuries in a boating incident on Aucklands Waitemat Harbour.
Police said emergency services were called to the scene at 5.15pm on Thursday evening.
The boat involved was a chartered vessel that had left the viaduct in the afternoon carrying about 30 passengers.
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A Coastguard spokesman said the chartered vessel contacted its Mechanics Bay centre to inform it that two people from the boat had gone overboard.
Both people were brought back onto the charter quickly but the woman who died had suffered critical injuries in the incident.
He was unable to confirm which vessel was involved.
The spokesman said another Coastguard vessel from the North Shore was paged to assist as well as police boats and a Westpac rescue helicopter were sent to the scene.
A distress call was also put out to other boats in the area to see if any medics were onboard that may be able to help.
Westpac Rescue Helicopter spokesman Lincoln Davies said a crew headed to the incident at 5.30pm.
An intensive care paramedic and doctor were both winched onto the police maritime boat and taken to the patient who died at the scene, he said.
Police said it was working with Maritime NZ to understand how the woman became critically injured.
Victim Support is being put in place for the other passengers on the boat.