Police are investigating an armed robbery which occurred at Woolworths Supermarket in Mowbray last night.

At around 9:50pm a male youth entered the supermarket and selected a quantity of items before attempting to leave the store without paying.

When the youth was approached by supermarket staff, he produced a knife and threatened staff before fleeing on foot.

No one was injured during the incident.

The male youth is described as 12-15 years old, slim build, wearing a black jumper and glasses.

Investigations are continuing.

Anyone with information in relation to the incident is asked to contact Launceston CIB on 131 444 or Crime Stoppers on 1800 333 000.