A dairy worker was allegedly threatened with a knife and robbed yesterday.

A woman entered the Worcester Discounter Dairy on Worcester St in Linwood, Christchurch about 1.45pm yesterday and allegedly threatened the shop attendant with a knife before taking cigarettes and running away, according to police.

No one was injured, but the victim was understandably shaken, police said.

A 16-year-old female has been arrested today in Timaru thanks to assistance from the public.

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She is charged with aggravated robbery and is due to appear in Christchurch Youth Court tomorrow.