The Northern Territory Police Force has arrested 2 women in relation to an aggravated robbery that occurred at Casuarina last night.

At 10.27pm, the Joint Emergency Services Communication Centre received a report from a security services company that a service station on Vanderlin Drive was being held up.

Casuarina General Duties officers attended the scene immediately and arrested 2 women aged 21 and 23 years old.

Earlier, the two women had been viewed by the service station employee attempting to steal a number of items.

When he confronted them the women allegedly threated him with edged weapons before he retreated behind the service counter and managed to lock the door.

The employee then opened the main doors to allow the offenders to exit the store where they proceeded to throw rocks and tools at the station window.

Soon after they were located and arrested and had in their possession a number of stolen items and edged weapons.

The offenders are in custody and are set to appear in Darwin Local Court on Monday, 28 April.