A man is in a critical condition after being found with a head injury and stab wounds.

Four people have been arrested on suspicion of attempted murder after the victim knocked on the door of a flat in Burnham Place, Park Terrace East in Horsham at around 1.30am on Wednesday (June 8) to seek help.

He was covered in blood and bleeding from his head. Emergency services were called.

The man was taken to Royal Sussex County Hospital where he remains in a critical condition.

Detective Chief Inspector Jon Hull said: "This man is an extremely serious condition so we have not been able to speak to him or establish who he is.

"We have no information about where he has been before he knocked on the door of the flat or what happened to him.

"He is a white man, slim and wearing a black fur-hooded jacket. Do you recognise the description of this man who might have been area during the evening?

"We are appealing to anyone who might have been in the Burnham Place or Park Terrace East area of the town from 9pm on Tuesday (June 7) and seen anything which could help us with our enquiries."

Four people, a 50-year-old man, a 34-year-old woman and a 27-year-old man from Horsham and a 30-year-old man from Pulborough have been arrested on suspicion of attempted murder and remain in custody at this time.

Detectives are appealing for anyone with information is asked to contact them on 101@sussex.pnn.police.uk quoting Operation Arkley.

Alternatively, those who can help and want to do so anonymously can call the independent charity Crimestoppers on 0800 555 111 or via crimestoppers-uk.org