Police say the stabbing of a man left outside Christchurch Hospital last night appears to be gang-related.
The 33-year-old remains in a critical but stable condition.
Police said he suffered significant lacerations to his head and is yet to undergo surgery.
Detective Sergeant Hamish Wilson said a scene examination is currently being conducted at an address on the outskirts of Christchurch.
"This was a very personal and callous attack, and the victim's injuries are significant. Detectives were working throughout the weekend and continue to work around the clock in an effort to identify and locate the person or people responsible," he said.
"We are following positive lines of inquiry but we would like anyone who has any information to come forward and speak to the police."
He said the matter was believed to be gang-related
Anyone with information is asked to contact Christchurch police on (03) 3637400.
To provide information anonymously contact Crimestoppers on 0800 555 111.
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