Shortly after 1pm on August 16, emergency services responded to reports of an assault involving a machete in Duke Street, Grafton.
A 24-year-old man was treated by NSW Ambulance paramedics at the scene before he was transported to Grafton Base Hospital in a serious, but stable condition.
Officers from the Coffs/Clarence Police District established a crime scene and commenced an investigation into the circumstances surrounding the incident.
Inquiries are ongoing.