A woman is believed to have been held at gunpoint as a man robbed a store in Nelson last night.
The man, who was wearing a balaclava, entered the Brook St Store around 7.15pm and demanded the assistant open the cash drawer.
He threatened to harm her if she did not co-operate, police said.
"The offender was carrying an item under a scarf which had the appearance of a pistol barrel. He took a sum of cash from the till before leaving without further incident," Detective Sergeant Ian Langridge said.
The man was believed to have fled the scene on foot.