Northern Territory Police are calling for witnesses following an aggravated robbery that occurred in Katherine early this morning.

Around 2am, a group of males entered a service station on Bicentennial Road and allegedly threatened staff before stealing the cash register.

While fleeing the scene, the group threw rocks at a parked ambulance causing the glass to shatter while the paramedics were inside the vehicle.

One paramedic was conveyed to Katherine Hospital to receive treatment for their injuries.

The group remain outstanding, and investigations are ongoing.

Police urge anyone with information about the incident to contact 131 444 and quote NTP2400103651.