Government departments “shouldn’t allow illegal ideas to filter through to the public through education, broadcasting, arts and culture, beautifying violence and clouding the conscience of the public,” Lam said.

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“I also call on parents, principals, teachers, and even pastors to observe acts of teenagers around them. If some teens are found to be committing illegal acts, they must be reported.”

Police and security officials said the stabbing of the 28-year-old policeman was a “terrorist,” lone-wolf attack, based on unspecified materials found on the attacker’s computer.

People went to the scene of the attack on Friday, some with children, to pay their respects to the attacker and lay flowers, drawing condemnation from Lam and other officials.

Lam said residents should not be deceived by messages circulating online suggesting the government had any responsibility for the violence, or by slogans such as “there’s no violence, only tyranny.”

“Do not look for excuses on behalf of the violent,” Lam said.

Reuters