Graft-busters have arrested 42 people for alleged corruption involving the theft of petrol from luxury vehicles imported to the mainland via Hong Kong. Among those arrested were the site supervisor of a subsidiary of a European car manufacturer, and a foreman of the transport contractor that delivers the cars to the mainland. Others arrested in the operation on Wednesday and Thursday included drivers working for the transport contractor and garage operators. A corruption complaint to the Independent Commission Against Corruption led to the discovery of a racket involving the siphoning of petrol from luxury cars during transit in Hong Kong, a person familiar with the investigation said. The imported vehicles' fuel tanks are filled with petrol on arrival in Hong Kong and transported to various car parks, before they are sent to mainland buyers. The ICAC, in a statement, alleged that drivers working for the transport contractor - responsible for the luxury cars during storage - stole petrol from the vehicles in the car parks. The stolen petrol was sold to the operators of various garages and other motorists. Investigations revealed that about 10 litres of petrol was stolen from each vehicle and the racket had been going on for more than two years. It was estimated that the amount of petrol stolen each year was worth about HK$500,000. The site supervisor was alleged to have accepted bribes from the transport contractor's foreman as a reward for conniving in the theft. All those arrested have been released on bail pending further investigations.