UPDATE: 6.20PM A man has been airlifted to hospital with serious injuries after being thrown from a vehicle during a collision near St Arnaud on Monday.
Victoria Police said a van was travelling along the Wimmera Highway when a truck began to overtake it shortly before 4pm.
The van, which tried to make a right-hand turn and collided with the truck, ran off the road and rolled, coming to rest in a paddock.
A male passenger was thrown from the van. He was airlifted to hospital in a serious condition.
Police said the van driver and another passenger were taken to hospital with minor injuries while the truck driver was not injured.
Any witnesses are urged to contact Crime Stoppers on 1800 333 000 or visit www.crimestoppersvic.com.au
UPDATE 5.15pm: Ambulance Victoria has confirmed one person has been taken to Bendigo hospital. Meanwhile, the air ambulance has arrived at the scene.
EARLIER: Emergency crews are responding to an accident near St Arnaud and three people are being assessed at the scene.
Ambulance Victoria and Victoria Police are responding to reports of a vehicle rollover 30km outside of St Arnaud near the Wimmera Highway.
The air ambulance has been called and is on its way.