It was thought all those involved were known to each other.
Neighbours were shocked to wake to news there had been a shooting at the Morley St flat.
Two close neighbours spoken to by the Herald expressed surprise that they had not heard a gunshot.
"The first I heard of anything was when the police came and spoke to me about 7am," said one man who did not wish to be named.
A police cordon, including armed officers, protected the scene this morning.
What appeared to be blood stains could be seen on the front door frames.
Locals said the occupants had only been living at the address for a few months.
"There were always a lot of cars coming and going," one resident said.
"You never expect this in your street. It's awful."
A scene examination took place this morning.
Police were seeking information about a 1998 purple Honda Accord, registration XC4771 and a black Subaru station wagon.
People were warned to not approach either vehicle but call 111.
If people had concerns or information to help with the investigation they could contact Christchurch Central Police Station on (03) 363 7400 or Crimestoppers anonymously on 0800 555 111.
