At around 5.30am this morning Kapiti-Mana Police were called to a Penguin Grove property in Waitangirua.
On arriving at the property, they were greeted by a distressed 49-year-old woman with a large cut to her arm.
Police heard an altercation coming from an upstairs room and have forcibly entered the room to find a 47-year-old male with a knife over a 39-year-old female.
Believing there was an imminent threat to her life, one officer has deployed a taser with a second shooting the man in the shoulder.
All three people were taken to Wellington Hospital by Ambulance staff. The 47-year-old will undergo surgery for the shoulder injury today but his injuries are not considered life threatening.
Police have launched an investigation, headed by an independent investigator from out of the area, and a scene examination will be undertaken over the course of the day.
The Independent Police Conduct Authority has been advised and they will undertake their own investigation.
Detective Inspector Paul Basham says "As with all incidents like this, we will undertake a thorough and independent investigation into what has occurred.
"The initial indications are that the two Police officers have acted professionally and taken decisive action to save the life of this woman".
• A media briefing will be held at the Penguin Grove address at 11.30am this morning.
For media inquiries please contact Nick Bohm, Wellington District Communications Manager, on 027 559 2235.