The official said investigators still do not have the green light to work in the cathedral and search in the rubble for safety reasons.
He said the monument is still being consolidated with wooden planks to support some fragile parts of the walls.
The probe was taking place as France paid a day-long tribute to the Paris firefighters who saved the famous cathedral from collapse and rescued its treasures.
The tributes came as construction workers rushed to secure an area above one of the church’s famed rose-shaped windows and other vulnerable sections of the fire-damaged landmark.
President Emmanuel Macron held a ceremony at the Elysee Palace to thank the hundreds of firefighters who battled the fast-moving fire at Notre Dame for nine hours, preventing the structure’s destruction and rescuing many of the important relics held inside.
“We’ve seen before our eyes the right things perfectly organised in a few moments, with responsibility, courage, solidarity and a meticulous organisation”, Mr Macron said. “The worst has been avoided.”
Mr Macron said the firefighters will receive a medal for their courage and devotion.
The huge cathedral, including the spire that was consumed by flames and collapsed, was in the initial stages of a lengthy restoration.
The roof was destroyed, but Notre Dame’s famous bell towers, rose windows, organ, and precious artworks were saved.
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