In May, 2002, eleven French naval engineers died in a bomb attack in the Pakistani port of Karachi, where they had been helping to build three submarines sold by France to Pakistan in 1994. The ongoing Paris-based judicial investigation into the murders is working on the theory that they were murdered in revenge for the non-payment by France to intermediaries of huge cash kickbacks. It has found evidence suggesting the kickbacks may have also involved illegal political funding in France. Central to this allegation are the presidential election campaign expenses of former prime minister Edouard Balladur, for whom Nicolas Sarkozy was campaign spokesman and which are due to be the subject of a second judicial investigation. Both deny any wrongdoing. However, Mediapart reveals how France's top administrative court smothered evidence suggesting the contrary.