The Northern Territory Police Force has arrested two females in relation to an aggravated robbery that occurred in Durack overnight.

Around 8:45pm, the Joint Emergency Services Communication Centre received a report that two offenders had entered a service station and threatened an employee with a knife before stealing items and fleeing the location on foot.

Police CCTV operators tracked the females through a nearby carpark, with police arresting the 20 and 15-year-old a short time later.

The 20-year-old remains in custody and is expected to be charged later today, while the 15-year-old is expected to be dealt with via summons.

Investigations into the incident remain ongoing.

Anyone with information, including with CCTV or dash cam, is urged to contact police on 131 444. Please quote reference P25325148. Anonymous reports can be made through Crime Stoppers on 1800 333 000 or via https://crimestoppersnt.com.au/.