A 15-year-old North Sydney Boys High student brandishing a large knife has been Tasered by police during a tense stand-off that forced the prestigious selective school to go into lockdown.

Police were called to the school on Sydney’s north shore just before 1pm on Thursday. The boy had armed himself with what one witness described as a chef’s knife, following a fight with another student.

The school, which has claimed the number one spot in the Higher School Certificate for the past two years, was put into lockdown for an hour as police responded to the danger.

Dramatic footage obtained by Nine News shows six officers pursuing the student wearing a red apron through the school grounds, with police urging him to drop the knife and threatening to deploy their Tasers. The officers follow

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