Three people are in critical condition after a man allegedly stabbed several individuals in a supermarket in Dunedin, in New Zealand’s South Island on Monday. Witnesses say they heard loud screaming and saw a man holding two knives before injuring four people, three of whom have been admitted to intensive care. Two supermarket employees were among the victims. Southern District Police Commander Superintendent Paul Basham told reporters those in critical condition would undergo surgery later today. The incident occurred at Countdown Supermarket, a subsidiary of Australia’s Woolworths. Basham said some of the victims were attempting to restrain the man and stop him from injuring more people. “I have viewed the CCTV footage, which is quite traumatic, and what I can say is that those that intervened, some of whom became injured themselves, I think have acted selflessly and with great courage to prevent this man from hurting anybody else” he …