Lancashire Police’s Force Major Investigation Team (FMIT) are leading the inquiry into an incident which left a man fighting for his life in hospital.
Police said a woman was seriously assaulted at a caravan park in Heysham and three other people were injured, one critically, after a series of road collisions that followed.
Officers were called at about 7pm on Saturday, September 20, following a report that a 32-year old-woman had sustained serious injuries after being hit over the head by a glass bottle during an assault at an address on the Ocean Edge caravan park.
She was treated in hospital for her injuries and released.
A short time after the assault, it is believed that a dark coloured Ford Fusion car was driven through the site security barrier away from the scene of the assault, and then collided with a 42-year-old man near to the entrance of the park.
The man, a 42-year-old from Heysham, was taken to Royal Preston Hospital where he remains in a critical condition.
Family Liaison Officers are supporting his family.
At about 7.15pm, a 53-year-old man walking his dog was then struck by what is believed to be the same car at Half Moon Bay. Fortunately he only suffered minor injuries.
Another collision occurred at about 7.30pm where a 36-year-old woman driving a Peugeot 207 was hit by what is thought to be the same Ford Fusion vehicle.
She was admitted to Lancaster Royal Infirmary with spinal injuries but has since been released.
A 45-year-old man from Heysham was arrested shortly after on suspicion of attempted murder, S18 – wounding with intent, drink driving, failing to stop after a road accident, driving a motor vehicle dangerously. He remains in police custody.
Detective Chief Inspector Dean Holden, who is leading the inquiry, said: “I am appealing for anyone who may have seen anything at all related to this serious incident, particularly if they saw the Ford Fusion car, to get in touch with us.
“May I remind the public that two people have been left with extremely serious injuries and myself and my team are working to establish exactly what has happened.”
Anyone with information can contact 101 quoting log number 1321 of September 20th or Crimestoppers on 0800 555 111.