A 16-year-old with links to Preston and Chorley is wanted over threats and assault.
Mackenzie Carter is 5ft 7in, of a slim build with brown floppy hair and brown eyes.
A police spokesperson said: "Carter is wanted in connection with an investigation into threats with a bladed article, actual bodily harm and assault.
"Do not approach Carter but call 999 if you see him. If you have any information please call 101."
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