The incident happened around 6.15am this morning when a man wearing a motorbike helmet entered the store with a weapon.

He stole money and fled the scene on a black moped.

Two female staff members witnessed the attack. They were not injured but were left upset.

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The suspect is white and wore a red and sliver helmet, a black North Face jacket with grey sleeves, grey trousers and white trainers. He was also carrying a black Adidas rucksack.

Police said extra patrols will be carried out in the area to reassure locals.

Detective Inspector Paul Grainger said: “This was a frightening attack which has left the two female members of staff badly upset.

“We are eager to trace the man responsible as soon as possible.