Major Collision Investigation Unit detectives are investigating the circumstances surrounding a collision in Preston this afternoon.
Emergency services responded to reports of a collision between a car and a motorcycle on Wood Street, near the intersection with McColl Street, on 26 October about 12.30pm.
The vehicle left the scene, before colliding with another vehicle at the intersection of Wood Street and Plenty Road.
The rider of the motorcycle, a 43-year-old man from Reservoir was taken to hospital with life-threatening-injuries.
Police are investigating whether the driver of the vehicle involved in the collision with the motorcycle - and the driver of the second vehicle involved in the subsequent collision - may be known to one another.
Detectives are also following up reports the vehicles appeared to be engaged in a chase with one another just prior to the critical injury collision.
The driver of first vehicle was arrested and will be interviewed later today.
The exact circumstances surrounding the collisions are yet to be determined and will be investigated.
Anyone who witnessed the collisions, has CCTV/dashcam footage or anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit an online confidential report at www.crimestoppersvic.com.au.
