There are no reports of any Australians being injured in the terror attacks in Brussels so far, Prime Minister Malcolm Turnbull says.
"It is very early days," he told the Nine Network on Wednesday.
"But at this stage we are not aware of any Australians being involved."
Mr Turnbull has spoken with the federal police commissioner, ASIO chief and Attorney General.
Their advice was there was no requirement to increase Australia's national terrorism threat advisory from its current level of probable.
There was already a high level of security at airports.
"We are in a much stronger position from a security point of view (compared to) Brussels," Mr Turnbull said.
"The reality is, of course, that we have the benefits of geography."
Mr Turnbull reassured the travelling public that strike action by Border Force and immigration department staff at international airports on Thursday would not affect security.
Federal police will be patrolling airports.
Australia has condemned the bombings which have killed about 34 people and injured more than 100.
"The Australian people absolutely condemn these cowardly terrorist attacks," Mr Turnbull told Seven Network.
"Our thoughts, our prayers, and our most resolute solidarity are with the people of Belgium.
"We are in a battle with these terrorists and we will defeat them."
Mr Turnbull said he had asked the heads of Australia's national security authorities to convene a meeting to review airport procedures in light of the events in Brussels which took place at the local airport and at a train station.
