The police who arrested the men in an anti-terror raid claim that the attack could have been the worst extremist attack that the country would have seen.
"The alleged offenders were prepared to inflict a sustained attack on military personnel until they themselves were killed," Tony Negus, acting chief commissioner of the Australian Federal Police was quoted as saying in a news agency report.
The four men who are of Somali and Lebanese descent are in their twenties. A 25-year old from the Glenroy district of Melbourne is charged with terrorism and is expected to appear in court later.
Speaking on this issue, the Prime Minister, Kevin Rudd said that this was a 'sobering' experience'. He, however, refused to think of removing the Australian tropps from Afghanistan.