Liquor store group owner-operator and managing director Palwinder Singh was left speechless when hearing of the latest arrest.
"That is shocking. Is that where the youth is going? I'm so shocked," he said.
"I've been in touch with our staff member who was attacked and I'm so relieved that he's making a strong recovery, he's in good spirits which is very pleasing.
Jaspreet Singh, 21, was stabbed at least seven times in an attack police have called "chilling", "callous" and "vicious".
Palwinder Singh said: "I've been in retail for the last 20 years and I've never seen anything like that.:
Singh commended police for their work in making four arrests in such a short period of time.
"We are very grateful. I'm so appreciative of the police and these arrests send out a very positive message to the community that this kind of behaviour will not be tolerated
"From a management point of view, family point of view and a staff point of view, we can't thank police enough."