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A student wielding a syringe has pricked eight teenagers in a "prank" at a high school in western Sydney, Australian authorities have said.

Several ambulances were called to Plumpton High School on Thursday following reports of a stabbing.

Students were found with "a minor needle prick" and no serious injuries, said New South Wales state police.

"A student was doing what appears to be a prank which involved a needle," a statement said.

The injured students received blood tests as a precaution. They were hurt on their hands and legs, according to paramedics.

Police have not yet spoken with the alleged perpetrator.