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 ... 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. I believe the real looting of Iraq after the invasion was by US officials and contractors, and not by people from the slums of Baghdad," said one US businessman active in Iraq since 2003. Iraqi leaders are convinced that the theft or waste of huge sums of US and Iraqi government money could have happened only if senior US officials were themselves involved in the corruption. American federal investigators are now starting an inquiry into the actions of senior US officers involved in the programme to rebuild Iraq. In the expanded inquiry by federal agencies, the evidence of a ... US businessman called Dale C Stoffel who was murdered after leaving the US base at Taiji north of Baghdad in 2004 is being re-examined. Before he was killed, Mr Stoffel, an arms dealer and contractor, was granted limited immunity from prosecution after he had provided information that a network of bribery - linking companies and US officials awarding contracts - existed within the US-run Green Zone in Baghdad. He said bribes of tens of thousands of dollars were regularly delivered in pizza boxes sent to US contracting officers.