A 17-year-old male has been arrested following an early morning break-in at a service station in Katherine South today.

Four youths entered the business about 4.30am after one accessed the store through a rear door believed to have been left unlocked.

Three of the offenders then forced their way behind the counter after prising open a Perspex barrier.

Two staff members retreated to a secure room and were not physically injured during the incident.

The offenders allegedly stole two cash registers containing about $400 before fleeing the scene.

Detectives are reviewing CCTV footage and investigations remain ongoing.

Police urge anyone with information about the remaining offenders to contact police on 131 444 and quote reference number P26134513.

Anonymous reports can be made through Crime Stoppers on 1800 333 000 or via https://crimestoppersnt.com.au.