Police are wanting to speak to anyone who was on SH1 in Invercargill on Saturday and saw an incident which ended with a man being shot by police.
The man had earlier fled police who had been attempting to locate him at his rural Invercargill address in relation to an alleged family harm incident.
He and his car were found a short time later stopped on State Highway 1 near Dacre.
Police say the man was in possession of a modified firearm, and confronted motorists.
They say he approached other vehicles, breaking the window of one and attempting to enter another before he presented a knife and came towards police.
He was shot by a police officer shortly before midday and was taken to hospital where he remains in a stable yet serious condition.
Police say in particular, they want to speak to the occupants of a black people mover which was travelling south towards Invercargill and was stopped near the incident as it occurred, as well as those who were in a black Ford Ranger travelling north, which stopped behind a black Mazda, and would have witnessed the incident.
Police say witnesses to the incident with information to share can call 105 and quote file number 220319/2126.