Police say a McDonald's in Manukau has been robbed overnight by a group wielding tools.
Four men entered the store just after 3am on Sunday armed with tools, police said in a statement.
Items were then stolen from staff, and a staff member assaulted, before the men left in a vehicle.
"The staff member was not seriously injured but was understandably shaken by the incident," police said.
The McDonald's was closed while investigations into what happened were carried out. A scene examination was being carried out on Sunday and staff were working with officers.
Police said they had "a strong line of enquiry" and wanted to reassure the public that the incident appeared to be isolated.
"We would like to hear from anyone in the area who witnessed the incident or who saw anything suspicious."
Anyone with information was asked to call 105 and to quote event number P055816860.