The Terrorists

Australia is under attack from religous terrorists from Indonesia, the Prime Minister is the target. The terrorists are hell-bent on destruction including parliament house in Canberra, their attacks are unique and ruthless and third attack is successful.
Thousands die in mass destruction of property, an assassin and team are sent out to neutralise the terror cell, but the FBI has other ideas.
There are leakers inside the Federal Police undermining the assassin, questions follow. Who's side is he on?