A woman has held up a petrol station at knifepoint in Pahiatua.

Detective Sergeant Grayson Joines said the armed robbery happened just before 9.40pm at a service station on Main St.

He said a female walked into the station armed with a knife and demanded the store worker give her cigarettes and cash.

Joines said no one was injured in the incident and the robber fled.

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Police were today carrying out a forensic examination of the petrol station this morning.