I read a novel recently about the IRA. In order to purify the ammonium nitrate to make a fertiliser bomb took a tremendous technical effort. However in this country ammonium nitrate is sold in two grades, fertiliser and explosives grade for the mining industry. So that making a truck bomb in this country would be easier than in most countries. Remember that there are mines within a couple of hours drive of Melbourne. I hope that beefed up security extends to mining sites.
Also I once saw a Fire Department video on high rise fires, "Towering Inferno" on steroids.
