Target of 'perfect' Brussels diamond heist was cash not gems Investigators have alleged that Marc Bertoldi, 43, a French car exporter with property in Antibes on the Cote d'Azur and a restaurant in Casablanca, provided the breakthrough after he arrived in Geneva. Following Mr Bertoldi's visit, police followed an as yet unnamed Swiss lawyer and real estate owner who were arrested on Wednesday after they made an exchange of a key to a cellar where, it is alleged, diamonds stolen in the robbery were discovered. Mr Bertolbi, 43, was arrested at a railway station in the Moselle on Tuesday and in his nearby Porsche police found €60,000 euros that, it is alleged, could not accounted for. He will be extradited to Belgium on 16 May and has protested his innocence. "He formally denies any involvement in the robbery and waits impatiently for his extradition to Belgium so he can give explanations about the charges," said his lawyer Olivier Rondu. The raid at Zaventem international airport is one of the biggest diamond robberies in history. Wearing masks, hooded police anoraks and armed with machine guns equipped with laser sights, the robbers struck at 7.47pm local time on a Monday night. After cutting through a security perimeter fence within a few hundred metres of Helvetica Airways flight LX789, the robbers used two black vehicles, a Mercedes van and an Audi car both equipped with blue flashing police lights, to race across the airport tarmac. Coming to a halt alongside the Brink's van and the passenger jet, four armed men left each vehicle and held up the aircraft's pilot, co-pilot ground staff and security guards. The robbers took only two minutes and 50 seconds to carry out the heist, described as "perfect" by investigators, after waiting for up to eight minutes inside a perimeter fence for the consignment to be safely unloaded from an armoured Brinks security van before launching the raid. The robbers then broke into the Swiss Fokker 100 airliner's cargo hatch in just a few seconds, the place where the consignment was at its most vulnerable in a five minute period before the plane taxied to take-off.