An official report says design and structural faults were to blame for the fatal collapse of a terminal at Paris's Charles de Gaulle airport last year.
The airport's Terminal 2E was not designed to support the stress it was put under, the report says.
The concrete used in its shell weakened gradually to a point that pillars pierced through it, causing the collapse that killed four people in May 2004.
French trade unions have claimed that work on the project was rushed.
The report says parts of the concrete shell of the terminal were cracked before it collapsed last year, but the structure itself can be saved.
