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Scott Morrison has condemned as evil and inhuman terrorist attacks in Afghanistan that killed more than 60 Afghans and 13 American troops in Kabul.
No Australian troops or officials died in the twin blasts which have been attributed to terrorist organisation Islamic State Khorasan.
But it is unclear whether Australian citizens, permanent residents or visa holders have been caught up in the bloodshed.
The prime minister said Australia joined with American and Afghan friends in mourning the terrible loss.
"Australian condemns the evil, the calculated and inhuman attacks that were undertaken in Kabul overnight on the innocent and on the brave," Mr Morrison told reporters on Friday.
Over a period of nine frantic days, Australian forces were able to evacuate 4100 people out of Taliban-held Kabul, thanks to the presence of American and British defence forces guarding the airport.
The evacuees included around 3200 Australians and visa holders and 800 people from coalition partner countries.
There are currently 2500 people staying at Australia's Dubai air base and 783 have either come to Australia or other countries.
Foreign Minister Marise Payne warned of a high threat of further terror attacks, meaning Australian evacuation flights had ceased.
"We know that this is a very distressing situation for Australians still in Kabul, for people with visas and for families and friends who are here in Australia," Senator Payne said.
Mr Morrison said further opportunities to get remaining Afghan visa holders out would be "very restricted".
People were warned not to travel to Kabul airport but move to a safe location and register with the Department of Foreign Affairs and Trade if they had not already done so.
Lawyer Glenn Kolomeitz said about 1000 embassy guards, interpreters and their families who helped Australian forces remained in Afghanistan.
Mr Kolomeitz served in Afghanistan and represents hundreds of Afghans entitled to protection in Australia.
As far as he knew, none of his clients were caught up in the bombings.
An interpreter family got through the airport gates just before the attacks.
US President Joe Biden has vowed to hunt down the people behind the attacks.
Defence Minister Peter Dutton signalled Australia would offer assistance if required.
"Australia has worked alongside the United States in every major battle in modern history and we will continue to work with the American allies," he said.
"We've stood by them through thick and thin and we will continue to do that into the future."
Labor's foreign affairs spokeswoman Penny Wong said there were grave concerns for Australian citizens and visa holders still in Afghanistan.
The Afghan Australian Advocacy Network's Arif Hussein said the irresponsible troop withdrawal directly contributed to the attacks and the current humanitarian crisis.
"After two decades of intervention and promises, the Afghan people are now abandoned to face the double threat of a Taliban rule, and ISKP attacks with the devastating consequence seen overnight," he said.
Australian Human Rights Commission president Rosalind Croucher urged the government to boost the humanitarian intake beyond the 3000 places set aside.
"We have asked for an urgent reassessment of all Afghan asylum seekers who have not received a positive protection finding, in light of the changed conditions," she said.