A woman remains in a critical condition this morning following the death of man involving weapons last night.
The Armed Offenders Squad was called to a Russell St address about 7pm after people reported yelling coming from the property.
Police described a ''chaotic'' scene where a man was found dead and a woman injured.
A Palmerston North Hospital spokeswoman said the woman remained critical this morning.
The spokeswoman could not comment on what injuries the woman had sustained.
Palmerston North police have launched an investigation after the incident, which involved weapons.
Detective Senior Sergeant Craig Sheridan, officer in charge of the Manawatu CIB, last night said a thorough scene examination was being conducted.
''Our priorities this evening are securing the scene overnight so we can conduct a thorough scene examination in the next 24 hours,'' Mr Sheridan said.
''We will also be working to determine the dynamic between the people that live at the address.''
The relationship between the two people is unknown, but there were children at the house, who have been taken to safety, Mr Sheridan said.
''At this stage it's too early to determine what has caused the injuries to both the man and the woman and what weapons were involved.''
Neighbour Barbara Bradnock said a young couple with two sons, aged 1 and 5, lived at the house.
A set of grandparents and another adult, a brother of one of the couple, with his twin daughters, were staying with them.
The family would often deliver her mail to her front door and she described them as friendly and polite.
Bradnock heard nothing, but had been asked by police to stay inside.
''I was just putting the jug on and looked out and there was a cop with a gun.
''I'm mortified ... they were the most amazing neighbours that you could ever wish for and I feel heartbroken that anything bad has happened to them.''
Kay Wilkinson, who was walking on Russell St, said she saw man lying on the ground in a driveway.
''I just saw a glimpse of a lady sitting with [someone] lying on his stomach ... I just happened to look and thought he had been hit by a car.''
The address has been cleared and police are not looking for anyone else.
- Manawatu Standard