Prime Minister Tony Abbott said the image was evidence of the hideous atrocities such groups are capable of. We see more and more evidence of just how barbaric this particular entity is, Mr Abbott said while in the Netherlands.Former army chief Peter Leahy told 3AW the image was beyond belief and he called on the Islamic community leaders to address the matter urgently. This sort of ideology that can support a father doing this and can support this sort of activity that we re seeing across the Middle East...let s hear the leaders in the Islamic community condemn this type of activity because if they don t what are they thinking, he said.Also speaking to 3AW, Monash University Global Terrorism Research Centre director Greg Barton said the children would probably follow in their father s footsteps. Having Australian children there I think will horrify the nation but I think it reinforces the concerns that we ve been taking over the past few weeks and authorities have been warning us about the threats back home here in Australia, he said.