Police in Poole, Dorset, are investigating the stabbing death of an 18-year-old man. According to reports, a teenager has come forward and is arrested on suspicion of murder. The victim was reportedly stabbed and then bundled into a car before being taken and left outside a hospital in Poole on Friday morning. Authorities are also holding four men in custody as part of the investigation. Police say they are trying to trace a vehicle connected to the incident, including locating the car they believe the group wanted. The reports describe ongoing inquiries into the circumstances leading up to the stabbing and the subsequent movement of the victim. Officials have not, in the provided accounts, detailed possible motives or identified the people involved beyond the ages and the custody status. The case remains under active investigation as officers continue to collect evidence and confirm timelines related to the attack and abandonment outside the hospital.