Pakistan nuclear material among least secure in the world:~ . Pakistan nuclear material among least secure in the world: Report â€“ The Express Tribune . . Report By AFP . Published: January 12, 2012 ++ . . Pakistan second behind North Korea in list of countries with least secured nuclear material. WASHINGTON: A Nuclear Threat Initiative index ranks Pakistan second behind North Korea as having the least secure nuclear material, hence posing the most risk, experts said on Wednesday. The index, which gave rankings on a scale of 100, listed Australia as having the tightest security controls among nations with nuclear material. The Nuclear Threat Initiative, in a project led by former US senator Sam Nunn and the Economist Intelligence Unit, aims to draw attention to steps that nations can take to ensure the safety of the worldâ€™s most destructive weapons. Among 32 nations that possess at least one kilogram of weapons-usable nuclear materials, Australia was ranked as the most secure. It was followed by European nations led by Hungary, the Czech Republic and Switzerland. On the bottom of the list, North Korea was ranked as the least secure of its nuclear material, edging out Pakistan. It also listed Iran, Vietnam and India below the 50-point threshold. â€œThis is not about congratulating some countries and chastising others. We are highlighting the universal responsibility of states to secure the worldâ€™s most dangerous materials,â€ said Nunn, who has long been active on nuclear safety. Nunn, a Democrat who represented Georgia in the Senate from 1972 until early 1997, voiced concern that the world had a â€œperfect stormâ€ â€“ an ample supply of weapons-usable nuclear materials and terrorists who want them. â€œWe know that to get the materials they need, terrorists will go where the material is most vulnerable. Global nuclear security is only as strong as the weakest link in the chain,â€ he said. The index, timed ahead of the March summit on nuclear security in South Korea, called for the world to set benchmarks and to hold nations accountable for nuclear safety. It also urged nations to stop increasing stocks of weapons-usable material and to make public their security regulations. North Korea has tested two nuclear bombs and in 2009 renounced a US-backed agreement on denuclearization. The world has watched warily since last month as young Kim Jong-Un takes over as leader from his late father Kim Jong-Il. Pakistan has vigorously defended its right to nuclear weapons. The father of Pakistanâ€™s atomic bomb, Abdul Qadeer Khan, admitted in 2004 that he ran a nuclear black market selling secrets to Iran, Libya and North Korea but later retracted his remarks. Australia does not have nuclear weapons and supports their abolition. But it has a security alliance with the United States and holds the worldâ€™s largest reserves of uranium.