Police respond to a collision in Gorseinon, Swansea, in which a car and an off-road bike are involved. Multiple outlets report that an 18-year-old is pronounced dead at the scene. A second person is also reported injured and taken to hospital; BBC News says the injured man is aged 19. Police treat the incident as a serious matter and announce that an 18-year-old has been arrested in connection with the death, with some coverage describing the arrest as part of a murder investigation. BBC also reports that investigations are ongoing. Separate reports note that roads are closed for several hours while police deal with the incident, reflecting the scale of the response. WalesOnline and other outlets update the public with statements from South Wales Police, while coverage continues as inquiries progress into what happened before and during the collision. No further confirmed details of the circumstances leading to the crash are provided in the excerpts.