A teenage boy has been accused of robbing a Newnham supermarket.
The 17-year-old was charged with armed robbery after the alleged incident at Newnham IGA on Sunday night.
Tasmania Police allege the boy entered the store about 5.40pm armed with a knife, before demanding money and fleeing with some cash.
The boy has been detained by police and is due to appear in an out-of-hours court sitting on Monday morning.
The staff member working at the supermarket did not receive any injuries as a result of the alleged armed robbery, police say.
Police would like to speak to anyone who may have witnessed suspicious activity in the Newnham area on Sunday night.
Information can be provided anonymously by calling Crime Stoppers on 1800 333 000 or online.