How close did America come to attacking Pakistan’s nuclear base in 1970s? [audio 29min]

America suspects that a particular country is developing a nuclear bomb even though it's leader strongly denies it. Prolonged economic and political pressure fails to persuade that nation to abandon it's weapons programme and there's talk of a military strike. This is not about the current stand-off with Iran but concerns the fierce row that developed between the USA and Pakistan during the late 1970s. India had recently tested its first nuclear bomb and its smaller neighbour, Pakistan, was desperate for parity. Committed to stopping such proliferation during these dangerous Cold War days, yet failing to do so at every step, a worried Washington began losing patience. With the help of formerly top secret papers and a number of key participants from the day, BBC journalist Mike Thomson investigates how close America came to launching a paramilitary attack or bombing raid on Pakistan’s nuclear base in the 1970s. Follow a link on the "Document" webpage to view a gallery of images related to this programme.