Police in Sydney say four teenagers have been arrested following a western Sydney home invasion in which a man’s hand was severed. Multiple outlets report that the incident involves an attack that left the victim with serious injuries. Police provide an update indicating that the suspects are now in custody as investigations continue into the circumstances of the assault. The reports describe the incident as a major development in an ongoing case, with authorities continuing to pursue leads and assess evidence related to how the attack occurred and what role each person may have played. While details of the investigation, including the exact location and time of the incident, are not included in the provided summaries, all accounts agree on the core facts: a home invasion occurred in western Sydney, the victim sustained a severed hand, and four teenagers have been arrested following police action. Investigators are expected to continue gathering information and may make further statements as the case progresses through the justice system.