Another man has been arrested on suspicion of murder after an 18-year-old man was found fatally injured near a hospital.
Dorset Police said the victim may have been stabbed in Dale Close in Poole and driven to Longfleet Road, 1.5 miles (2.4km) away, where he was found at 02:13 BST on Friday.
A 19-year-old man, from Poole, came forward overnight and has been arrested on suspicion of murder and remains in custody, police said.
Five men were arrested on Friday and three of them remain in custody.
A 20-year-old man from Blandford who was arrested on suspicion of murder remains in custody.
A 22-year-old man from London and a 22-year-old man from Bletchley, Buckinghamshire, who were initially held on suspicion of assisting an offender, have since been further arrested on suspicion of murder.
They also remain in custody.
Two men, aged 36 and 38, from Bournemouth, who were arrested on suspicion of murder have been released and will face no further police action.
