Dunedin supermarket stabbing: One of the bystanders injured in Countdown stabbing a Corrections staffer

A staffer at the Department of Corrections is one of four people seriously injured in a stabbing rampage at a Dunedin supermarket on Monday. 

At around 2:30pm on Monday, a man allegedly stabbed four people - including two supermarket employees - at Countdown Dunedin Central on Cumberland St. 

On Tuesday, Corrections' southern regional commissioner Ben Clark confirmed one its staffers is among the injured.

It's understood the remaining victim is the staffer's wife. 

"A member of our staff was injured in the incident at a Dunedin supermarket yesterday afternoon," Clark said.

"Our focus is ensuring the staff member, their family and colleagues have all the support they need during this stressful and difficult time.

"We would like to thank the emergency services, police and supermarket staff for the help they provided following the incident. 

"To respect the privacy of our staff member and their family, we will not be providing any further comment."

On Tuesday morning, police confirmed the suspect - a 42-year-old male - had been charged with four counts of attempted murder. He is scheduled to appear in the Dunedin District Court at 2:15pm.

Documents reviewed by Newshub say the suspect has no fixed abode and no listed occupation. 

According to Stuff, it's believed the Corrections staffer received a knife wound to the neck and his wife was stabbed in the back. 

In a statement on Tuesday morning, police said three of the injured are in a serious, but stable condition. The fourth person is in a moderate condition.