Police are investigating two arson attempts in the Upper Burnie area overnight.

About 1:00am this morning police and emergency services were alerted to a fire outside of a supermarket in Upper Burnie.

Three youths were observed running away from the scene by witnesses.

Tasmania Fire Service and Tasmania Police attended, and the fire was extinguished.

At about 1:35am, a second arson was attempted at the shop in Upper Burnie where windows were also smashed.

A 14-year-old youth is currently in police custody assisting with their enquiries.

Anyone with information is asked to contact police on 131 444 or Crime Stoppers Tasmania via crimestopperstas.com.au. Please quote reference number: 734121 or 734126. Information can be provided anonymously.