A Northland school is in lockdown after a man fled through the grounds following what is thought to have been a knife fight.

Whau Valley Primary School, in Whangarei, went into lockdown about 12.45pm after a man was seen running with a knife through the grounds.

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A reporter at the scene said police officers were talking to people at a nearby house and others officers were searching the area for the person seen with a knife.

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As at 12.15 the school remained in lockdown.

More soon.