French MPs have approved a law on the reconstruction of Notre-Dame cathedral, three months after it was ravaged by fire.

The cathedral, part of a UNESCO world heritage site covering the banks of the River Seine in Paris, lost its gothic spire, roof and precious artefacts in the 15 April blaze.

Tourists in Paris are still heading to Notre-Dame to take photos and selfies, with the horrific fire only increasing its global fame, although they cannot access the esplanade in front of the building let alone the edifice itself.

But the passing of the reconstruction bill in the National Assembly - after months of squabbles - marked only the start of the hugely controversial and sensitive rebuilding process.

"The hardest thing is now ahead of us. We need to strengthen the cathedral for ever and then restore it," said Culture Minister Franck Riester as the bill was passed.

French President Emmanuel Macron has said the reconstruction should be completed within five years, a deadline some experts see as too ambitious.

Mr Macron created an even greater furore by suggesting the toppled spire could be replaced by a steeple with a contemporary touch.

The "aim is to give Notre-Dame a restoration appropriate for the place it has in the hearts of the French people and in the entire world," said Mr Riester.

The bill aims to organise the €850 million in donations that were pledged from individual, corporate and private donors after the blaze and to coordinate the restoration work.

French luxury goods rivals, the billionaires Bernard Arnault and Francois-Henri Pinault, pledged €200 and €100 million apiece and they are likely to disburse the funds gradually to ensure they are spent well.

But the bill's passage through parliament was held up by objections from the opposition, who complained the process was being rushed simply to ensure reconstruction was finished for the 2024 Olympic Games hosted by Paris.

Brigitte Kuster of the opposition Republicans said: "Imposing a deadline of five years from on high makes no sense."

But Mr Riester insisted: "We are not confusing speed with hurry," adding that the cathedral was "not entirely saved" and that there was "still a risk" of collapse in some areas.

The upper house Senate and lower chamber National Assembly failed to agree on a common text and the draft then went back to the National Assembly - where Mr Macron's party has a majority - in a slightly modified form.

There, 91 MPs voted for the bill with eight votes against and 33 abstentions.

Mr Riester also urged against complacency despite the high amounts pledged, saying that only 10% of these promises have been realised as actual donations.

The architectural form of the reconstruction is not directly addressed in the text, although it was discussed in parliament, where some deputies expressed concern over Mr Macron's interest in a "contemporary architectural gesture".

Meanwhile, the Paris authorities remain concerned about above average amounts of lead from the roof present in the area around the cathedral, meaning its immediate vicinity is still closed.

The scaffolding around the cathedral and white canopy serving as a temporary roof mean Notre-Dame is a shadow of its pre-fire self, even if the two great mediaeval towers were preserved in all their glory.

Dozens of workers are at the site every day but they are focusing on securing the site and clearing debris rather than restoration.

The vault in particular is at risk of collapse and the process of securing it will last until the autumn, according to the culture ministry. Only then can an architect carry out a thorough check of the edifice before restoration work begins.

Paris prosecutors said in June a poorly stubbed-out cigarette or an electrical fault could have started the fire and opened an investigation into criminal negligence without targeting any individual.

On 15 June, two months after the fire, clerics conducted the first mass inside the cathedral since the blaze, donning hard hats along with their robes for their safety.