Saudi Arabia says it reserves the right to military action against Iran, after it was targeted by Iranian ballistic missiles.
Iran has been striking Qatari, Emirati and Saudi oil-and-gas facilities, in retaliation for an Israeli strike on a key gas field.
Saudi Arabia has come under attack by hundreds of Iranian missiles and drones since the start of the war - most have been intercepted - but today's attacks mark the first time many in the capital Riyadh heard blasts or received warning messages via text.
The prime minister Anthony Albanese is urging Australians not to panic buy petrol as a national task-force to ensure fuel flows to affected regions is established.
Former Australian Energy Regulator chief executive Anthea Harris has been appointed to coordinate national fuel supply chains in conjunction with states and territories.
Opposition leader Angus Taylor says he supports the establishment of a fuel supply task force but says the energy minister should have acted sooner.
Severe Tropical Cyclone Narelle has intensified into a category five system as it edges closer to the far north Queensland coast.
The system is about 300 kilometres north-east of Cooktown.
It's expected to make landfall tomorrow morning between Lockhart River and Cape Melville as either a Category 5 or 4.
Queensland's Premier David Crisafulli says there'll be destructive winds and heavy rain from tonight, and the defence force is on stand-by to help with disaster response.