Police say a person is in custody after a dead body and an injured teenage girl are discovered in Perth. According to reports, officers respond to the incident and find the deceased person and a teenager who has sustained injuries. Following the discovery, police take a person into custody as part of the investigation. Authorities also close a major highway in the area while they manage the scene and carry out inquiries. The reports do not specify the person’s identity, the teen’s condition, or the circumstances surrounding the deaths and injuries. Police have not indicated a motive in the available summaries, and further details are expected as investigations continue. The closures remain in place to allow police to conduct forensic and other investigative work, and to maintain public safety in the vicinity.