Police in New South Wales have arrested two men over the alleged kidnapping and murder of 85-year-old Sydney grandfather Chris Baghsarian.

Police say he was abducted from his North Ryde home earlier this month and authorities suspect his captors mixed him with someone living nearby who has links to organised crime.

Yesterday, police found human remains near a golf course in Sydney's north west believed to be those of the elderly victim.

Police searched two homes in that area and two men in their 20s were arrested.

A Labor frontbencher is urging leaders 'to take the temperature down' after a security threat forced the evacuation of the Prime Minister from his Canberra residence overnight.

While opposition leader Angus Taylor says he's pleased to hear the PM is safe and well after the incident.

The Australian Federal Police say they searched Anthony Albanese's house but nothing suspicious was found.

The AFP says it'll release more details at a later time.

Almost 3000 people are still without power after storms caused havoc across Victoria.

There's also been hundreds of callouts for help in Melbourne.

Meanwhile a large slow moving weather system is drenching a huge part of central Australia.

While it's caused havoc for transport, many graziers are celebrating the intense rains which will help set them up for the year ahead.