A 16-year-old has been arrested with the alleged robbery of a Linwood dairy.
Police say the public helped assist their inquiries into a robbery of Worcester Discounter Dairy on Thursday.
This resulted in the arrest in Timaru of a 16-year-old who has been charged with aggravated robbery.
She will appear in the Youth Court on Saturday.
At about 1.50pm on Thursday it is alleged she robbed the dairy at knife point, making off with $1000 worth of tobacco.