Avalon Airport in Melbourne, Victoria, is evacuated after airport security detects a suspicious item during screening early this morning. Multiple reports say bomb-squad officers are called to the scene and the airport coordinates an evacuation, with travellers required to leave parts of the terminal while authorities assess the situation. One person is detained following the incident, and police state that an arrest has been made in connection with the reported bomb scare. Authorities treat the item as potentially dangerous while security personnel and specialist responders examine it. The reports are consistent that the alert originates from the screening process rather than from a separate on-site incident, and that the response includes evacuation measures and involvement of bomb disposal specialists. Details about the item and its final assessment are not provided in the available summaries, and further information is expected as investigations continue.