Police in western Australia investigate the death of a mother and serious injuries to her 12-year-old daughter after a 16-year-old is arrested. Reports say officers went to a property in the Perth area following concerns raised when the mother is found dead. The 12-year-old daughter is located nearby after fleeing the home and calling police, and is described as having serious injuries. Other reporting says the injured girl is later spotted about 600 metres away on a busy highway by passing motorists, before police attend. Police believe the incident involves family violence and treat it as a serious matter. A 16-year-old boy is arrested in connection with the death and is held while inquiries continue. Authorities do not indicate the suspected weapon or provide further details on the circumstances leading to the mother’s death, while medical assessments and interviews are ongoing. The girl’s condition is described as serious, and police appeal for information as they work to establish a full timeline.