About 8.10pm a man entered the store on Ravenswood Road, armed with a knife.

His face was covered by a motorcycle helmet and he confronted two staff members.

He stole a small amount of cash, but no one was injured.

Police hope the public can assist in the investigation.

Detectives are following a certain line of inquiry.

Anyone with information about the crime, or anyone who witnessed a small motorcycle or scooter in the area at the time of the incident, is urged to contact Launceston Criminal Investigation Branch on 131 444.

People can also contact Crime Stoppers anonymously on 1800 333 000.

Last August, the store owner’s mother was targeted in an alleged vicious assault by two men.

The 70-year-old was allegedly beaten in her home by two masked men.

The offenders allegedly gained entry to the Taroona Court house through a window before carrying out their targeted attack.

One of the men allegedly shoved the woman to the ground violently – busting her face open in the process – before stealing $600 and her car, and fleeing with the other masked person.

At the time, the woman, Yvonne Apted described how she put up a fight.

“I had blood running down my face,” she told media.

“I wasn’t scared, but I was worried. The police have been very helpful.”