Man armed with gun arrested in Runnymede overnight

A man has been arrested after Victoria Police responded to reports of a man who was allegedly armed with a gun in the Elmore area.

The incident occurred on the Northern Highway in Runnymede after a report was made to police at 11.30pm on Saturday night.

The man drove his vehicle south where he pulled over and remained inside the car. 

The area was cordoned by police and the Critical Incident Response Team arrested the man. 

He has been taken to hospital and believed to have sustained a head injury. 

The exact circumstances surrounding the incident are yet to be determined. 

The investigation is ongoing.