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.
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Advertise with NZME.A St John spokeswoman said an ambulance took one patient in a moderate condition to hospital.