A female robber held up a dairy, took cash, assaulted the owner then fled the scene on a bicycle.
The incident happened about 6.30pm this evening in Palmerston North and left a man needing hospital treatment.
The female offender arrived at the Westend Store on the corner of Botanical Rd and College St on a bicycle, police said.
"The offender has entered the store and threatened the female store owner and demanded money," police said.
"After taking cash the offender has fled the store and been confronted by a male store owner on the street outside the store. The male has been assaulted and has suffered injuries that require hospital treatment.