A 'computer glitch' may have been behind the fast-spreading fire that ravaged Notre Dame, the cathedral's rector said on Friday, AP reported.

Bishop Patrick Chauvet did not elaborate on the nature of the cause. “We may find out what happened in two or three months,” he told a meeting of local business leaders.

The Parisien newspaper has reported that investigators are considering whether the fire could be linked to a computer glitch or related to temporary elevators used in the renovation that was underway at the time the cathedral caught fire.

Chauvet said there were fire alarms throughout the building, which he described as 'well protected.'

The fire broke out at around 6:30 pm Monday, and the roof, the clock and spire was damaged. According to preliminary reports, the fire started during the restoration works. The French authorities said large fire has been extinguished. Paris municipality will allocate 50 million euros for restoration of Notre Dame cathedral which was heavily damaged because of fire.