Cleveland Police was called to reports of an incident in Maxwell Road just before 4.15am on Tuesday
Cleveland Police has confirmed that a man aged 21 was rushed to James Cook University Hospital in Middlesbrough.
He was found with serious leg injuries to both of his legs and was found on Maxwell Road, Owton Manor.
Eyewitnesses have told Police Hour they heard a man shouting in the street before hearing a loud bang and then a man shouting “i’ve been run over, I’ve been run over”.
It is believed two cars were heard driving up and down the road at speed before the incident.
A Police cordon has been in place on Maxwell Road Hartlepool all day around a house which has been damaged.
Police are now appealing for anyone with information to come forward if they witnessed or heard anything in relation to the incident.
Four people have been arrested in connection with the incident and remain in police custody. They are three men aged 27, 29 and 27 and one woman aged 23.
Anyone with information is asked to contact Cleveland Police on 101, or anonymously to Crimestoppers at www.crimestoppers-uk.org or call 0800 555111.