In a prominent case that occurred on the premises of Charles de Gaulle International Airport in France, a portion of the terminal roof collapsed and four people were killed and three injured in 2004. The results from an administrative inquiry revealed that an array of procedural and structural issues were to be blame for the collapse. It was found the concrete vaulted roof was vulnerable to exterior temperature swings. Sources close to the enquiry also disclosed that the whole building chain had worked as close to the limits as possible, so as to reduce costs. In particular, it was pointed out that there margin for safety was also minimal. Upon further investigation, structural surveyors concluded that the roof was beyond repair and so the entire vault of Terminal 2E had to be demolished and re-built at a significant expense; €130 million or US$205 million. Subsequent legal proceedings failed to apportion sole responsibility for the event because of uncertainty and interdependency of events that led to the failure occurring.