UPDATE: Arson ruled out; structure of Notre Dame cathedral has been saved
UPDATE:The Paris prosecutors' office says investigators are treating the blaze that destroyed part of Notre Dame as an accident for now.
The structure of Notre Dame cathedral has been saved; fire not spreading to northern belfry.
The prosecutors' office said late Monday they have ruled out arson in Monday's fire, including possible terror-related motives for starting the blaze.
Prosecutors say Paris police will conduct an investigation into "involuntary destruction caused by fire."
PREVIOUS STORY: -Paris police say there is a fire at the French capital's iconic Notre Dame Cathedral.
Flames and black smoke were seen shooting on Monday from the base of the medieval church's spire, which is undergoing renovation.
French media quoted the Paris fire brigade saying the fire is "potentially linked" to the renovation work.
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