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Armed with a huge knife, the schoolchild appears to lunge towards the frightened crowd before he was shot by police.

The boy remains in critical condition in hospital after the incident in Reno, Nevada.

The teenager was filmed holding a large knife in his hand as pupils gathered around outside Hug High School.

One person can be heard shouting “back up, back up!” as the schoolchildren rush away from the armed teen who appears to have blood coming from his mouth.