ISLAMABAD The US military and its key partner, UK, are in talks with other countries to ensure over zero access of Afghan insurgents to the precursors and chemicals used in producing home-made bombs with Ammonium Nitrate being on top of the list. Well-placed sources informed TheNation that both the countries were pursuing these talks under the project called 'Global Shield. However, the US Embassy here has expressed its complete ignorance of these developments and instead referred to ISAF in Kabul when this scribe approached it for comments. Since this issue relates to ISAF, you better approach them in Kabul, US Embassys acting spokesperson Ms. Courtney Baele said in response to a question. However, other sources privy to these developments were of the view that top-notches of the US and UK militaries had launched the initiative after growing threats to their soldiers of the home-made or roadside bombs being used by the insurgents against the multinational forces in Afghanistan. The sources said that the US-led multinational forces in Afghanistan had seized 250 tons of ammonium nitrate fertilizer in the southern city of Kandahar on November 10, 2009, adding Ammonium Nitrate fertilizer accounted for making about 95 percent of the bombs in Afghanistan which over the time had led to phenomenal increase in the number of casualties of the international troops. US troops in southern Afghanistan had to compensate local farmers by offering them about 28 US dollars - double the market rate - for each 50-kilogram bag of ammonium nitrate fertilizer, the sources said. The sources were of the view that these developments had prompted the Afghan government to impose a complete ban on these substances in January 2010. In Pakistan, the provincial government of Khyber Pakhtunkhwa had also imposed ban on ammonium nitrate, ammonium sulphate as well as calcium ammonium nitrate in the Malakand Division on November 2009 after realising that militants made explosives using these chemicals. However, some sources were of the view that US and UK militaries which had led the campaign against Al-Qaeda and Taliban in Afghanistan in late 2001 shortly after the 9/11 episodes, were actually trying to cover up their culpability in the massive use of bombs made out of these chemicals and used in Afghanistan.