In what could turn out to be the greatest fraud in US history, American authorities have started to investigate the alleged role of senior military officers in the misuse of $125bn (£88bn) in a US -directed effort to reconstruct Iraq after the fall of Saddam Hussein. The exact sum missing may never be clear, but a report by the US Special Inspector General for Iraq Reconstruction (SIGIR) suggests it may exceed $50bn, making it an even bigger theft than Bernard Madoff's notorious Ponzi scheme.