An Australian was shot and wounded during a deadly commando raid on ships taking humanitarian aid to the blockaded Gaza Strip.
Foreign Minister Stephen Smith said the man had been treated in hospital following the "terrible and shocking incident", which left nine pro-Palestinian activists dead.
Mr Smith said the unidentified Australian had been shot in the leg, and was being given consular assistance.
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Two other Australians, Fairfax journalists Paul McGeough and Kate Geraghty, were on board the ships, but were not hurt and are being detained in an Israeli detention centre
'Terrible, shocking incident'
"We don't have any information that any other Australians have been caught up either injured or killed at this stage," Mr Smith told ABC Radio.
Consular officials were working "very actively" and "strenuously" to determine the welfare of other Australians who may have been aboard the flotilla, he said.
"It's a terrible and shocking incident and people have genuinely been shocked by it," Mr Smith said, adding it was appropriate for Australia to deplore the violence and deaths.
"But we do need to proceed very calmly, there's always claim and counter-claim."
Australia has called on Israel to hold "a credible investigation that needs to be subject to the scrutiny of the international community through the (United Nations) security council".
Call for 'credible' investigation
"The onus is on Israel to provide a detailed explanation as to these matters," Mr Smith said.
Israel also would have to explain its use of force and possible use of disproportionate force, Mr Smith said.
He said Australia maintained its view that Israel should ease its blockade of Gaza to allow aid and humanitarian assistance through.
Australian officials "at every level" in Canberra and Tel Aviv were in close contact with their Israeli counterparts, he said.
"They're putting our view which goes to the easing of restrictions or access to the Gaza for aid and humanitarian assistance and also for a credible response to this shocking incident."
