SYDNEY—Australia called up 3,000 defense-force reservists and ordered in more waterbombing planes to help fight ravaging wildfires as temperatures topped 100 degrees Fahrenheit Saturday.

Prime Minister Scott Morrison also deployed the Australian navy’s largest amphibious ship, the HMAS Adelaide, to support the evacuation of fire-affected areas along the southeastern coast. Two other navy ships, stationed near the town of Mallacoota in Victoria state, attempted to rescue 1,100 more people Saturday.

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