I fully agreed to the views of sandeep menon. i am software engineer. i know this attack is a political one no doubt about it. i live in sydney what extent can people do crime hre the govt knows very well. if i purchase 10 mg of any chemical i have to show my identity and the purpose of use of chemical. after 10 min of investigation then only i can purchase a ordinary chemical.if chemical belongs to some explosion forget about buying it.just forget the chemicals, u can't purchase a medicines with out doctor prescription it doesn't matter how emergency u are in.for every platform whether it is for train, Airport, bus station inevery public place there is suveliance camera. even in trains and buses. so there is no chance of getting a crime here. even if does culprit will be caught in hours or even minutes. so in my opinion there is some one with political power is making this to happen for gain which can be unknown to human beings. Al-qaeda can be destoyed and osama can be killed in 1-2 days but they are alive.because U.S don't want them to destoyed and killed.even Top BBC, CNN other are the puppets of U.S what they say every people will accept even our national media broadcast it