One person was taken to Whanganui Hospital after an alleged assault at the Rangitikei Street Store in Whanganui East on Monday afternoon.
A police spokeswoman said three people entered the shop around 1.05pm and assaulted the owner.
They then left on foot.
Inquiries into the matter were ongoing, she said.
A St John spokeswoman said an ambulance took one patient in a moderate condition to hospital.
