The Northern Territory Police Force has arrested two female youths in relation to an aggravated robbery that occurred in Yarrawonga on Saturday evening.

Around 7:15pm, the Joint Emergency Services Communication Centre received reports of an alarm activation at a service station on Yarrawonga Road.

It is alleged that the two females threatened staff before one female jumped behind the counter and stole a large quantity of cigarettes. The offenders then fled the scene on foot.

The staff member was able to safely secure himself in the back office during the incident.

A short time later, Strike Force Trident arrested two females aged 12 and 15 at an address in Gray.

Both youths have been charged with aggravated robbery and will face court at a later date.

Police urge anyone with information about the incident to make contact on 131 444. Please quote reference number P25100536. Anonymous reports can be made through Crime Stoppers on 1800 333 000 or https://crimestoppersnt.com.au/.