United States and the United NationÂ’s (UN) atomic watchdog must be allowed to question Pakistani scientist Abdul Qadeer Khan to learn if he sold blueprints to Iran or North Korea, Former UN Arms Inspector David Albright said on Monday.David Albright now suspects Khan, the father of PakistanÂ’s atomic bomb, who was placed under house arrest for overseeing a network that sold nuclear weaponsÂ’ secrets and equipment, for spreading the plans for an advanced nuclear warhead in a new report. After details of the report appeared in US newspapers, Albright said that there was a danger that Khan might be released without answering questions about the sensitive blueprints, which show how to build a warhead compact enough to fit on a ballistic missile.