Earlier in the night two men armed with weapons went into the Onerahi Foodmarket about 6.30pm.
The offenders demanded money and cigarettes from the two store owners, a man aged 29, and a 22-year-old woman. The woman handed over the items and then one of the offenders struck the man with a weapon.
Both offenders fled. The man was taken to Whangarei Hospital with a head injury and was discharged this morning.
Police would like to hear from anyone who witnessed the aggravated robberies in Onerahi and the Forum North carpark or who may have seen any suspicious activity in these areas.
Anyone with information can call Whangarei Police on 09 430 4500 or if they want to remain anonymous they can call Crimestoppers on 0800 555 111.