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Police are warning users of the Whanganui River to beware of a shark that has been spotted swimming up the river.
It was last seen at about 12.10pm about 200m north of Dublin St bridge.
Acting Sergeant Michael Roycroft from Whanganui Central police said a number of people had seen the shark, including himself.
"We saw a dorsal fin which we believe belongs to a shark. It's probably a metre to a metre-and-a-half long."