A 22-year-old student was stabbed at the University of Sydney's Camperdown campus by a 14-year-old boy in military clothing.

The incident triggered a major police operation and lockdown.

The suspect left a knife at the scene and is undergoing a mental health assessment.

Counter-terrorism police are involved in the investigation, but the motive for the attack remains unknown.

The boy had no known religious ideology but had previous interactions with authorities.

The New South Wales Joint Counterterrorism Committee is involved, but there's no ongoing threat to the community.

Concerns have been raised about the ease of self-radicalization among young people.

The university has reopened with increased security measures, and the state government has tightened knife laws in response.

The victim is in serious but stable condition at Royal Prince Alfred Hospital.

The university is collaborating with authorities to ensure the safety of students and staff.