Businessman and former Hell's Pizza franchisee Matthew Blomfield was assaulted in an incident with a gun over the weekend.

Waitemata police said they attended an incident of two men fighting at an address in Greenhithe on Saturday night, "and that a gunshot had been heard".

"Armed police arrived on the scene and found a 38-year-old man with facial injuries. The offender had fled [and] remains outstanding and unidentified," a police spokeswoman said.

"The 38 year-old was taken to hospital for treatment and has since been discharged. A scene examination and an area canvass have both been conducted. Inquiries are ongoing and Victim Support are assisting the man and his family."