200 specialist employees were working on the wooden spire.
Detectives in Paris have been interviewing specialist restorers who were working on Notre Dame Cathedral before fire ripped through the roof.
Some of its 200 specialist employees were working on the wooden and lead spire of Notre Dame Cathedral that collapsed on Monday evening. It had won the contract to restore the Notre Dame spire that was designed by the architect Eugene Viollet-le-Duc and erected in 1859.
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