WELLINGTON: The Islamic State-inspired radical responsible for a supermarket knife rampage in New Zealand was watched for five years and jailed for three before authorities exhausted all avenues to keep him detained, Prime Minister Jacinda Ardern revealed Saturday.

The 32-year-old Sri Lankan was only freed in July and had been under police surveillance since.

On Friday, he grabbed a knife off a supermarket shelf in Auckland and attacked seven people, leaving three critically wounded, before he was shot and killed by the armed police tasked with tailing him. Court suppression orders meant Ardern could not explain why the terrorist had not been deported, but she said measures were already underway to strengthen New Zealand’s terrorism suppression laws.

The man, who arrived in New Zealand on a student visa in 2011, came to the attention of police in 2016 after expressing sympathy on Facebook for terrorist attacks.

He was arrested in 2018 on charges of possessing a knife and objectionable material and was considered to be planning a “lone wolf” knife attack.