Three people have been arrested after an aggravated robbery in Palmerston North during which staff were threatened with a firearm.

The robbery happened at a Main St service station on September 20. Police were called to the scene at 8.40pm after two people entered the store with a firearm.

They allegedly threatened the staff and fled with cash. Nobody was injured but store staff were shaken, police said.

Following a scene examination and ongoing investigation, three people have now been arrested and charged in relation to the incident.

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The first offender was arrested on Thursday last week. He is on bail and due to appear in court tomorrow.

Two other offenders were arrested today, a 17-year-old and an 18-year-old, and they are both due to appear in court tomorrow.

The victims are receiving ongoing support.