Parisians gathered in front of Notre Dame on Tuesday night, at a vigil where music was played and attendees prayed for the future of the cathedral.

The fire which devastated the cathedral is thought to have been caused by an accident rather than arson, the Paris public prosecutor said.

Investigators are working to establish what led the centuries-old architectural masterpiece to be consumed by flames on Monday evening.

Fifty investigators are working on the probe and will interview workers from five companies, hired to renovate Notre Dame’s roof.

Remy Heitz, the Paris prosecutor, said the inquiry into the Notre Dame fire would be “long and complex”.

Notre Dame fire: What was lost and what was saved Show all 13 1 /13 Notre Dame fire: What was lost and what was saved Notre Dame fire: What was lost and what was saved Statue of Saint Denis Notre Dame https://commons.wikimedia.org/wiki/File:Paris_-_Cath%C3%A9drale_Notre-Dame_-_Portail_de_la_Vierge_-_PA00086250_-_003.jpg Thesupermat/CC-BY-SA Thesupermat/CC-BY-SA Thesupermat/CC-BY-SA Notre Dame fire: What was lost and what was saved "Close up of Virgin Mary and Baby Jesus statues at Notre Dame Cathedral in Paris, France. Other images of the Notre Dame Cathedral:" gregobagel Getty Images/iStockphoto Notre Dame fire: What was lost and what was saved Safe: Rose windows Among the most famous architectural features of the Gothic masterpiece, the stained glass rose windows are treasured artworks. The three rose windows, which date back to the 13th century, adorn the north, south and west facades. There were hopes the windows had escaped being destroyed by the fire after firefighters stopped its spread. Photos the following morning suggested the circular window of the nave had remained intact. AFP/Getty Notre Dame fire: What was lost and what was saved Destroyed: Irreplaceable wooden roof Crowds of tourists and Parisians watched in horror as the spire and roof of Notre Dame cathedral came crashing down to the ground. EPA Notre Dame fire: What was lost and what was saved Safe: Descent from the Cross The cross and statue on Notre Dame's high altar - sculpted by Nicolas Coustou in 1723 - were believed to have survived in tact despite being surrounded by smoke and debris. Reuters Notre Dame fire: What was lost and what was saved Safe: Great Organ With nearly 8,000 pipes, some dating back to the 1700s, Notre Dame's master organ is one of the largest in the world. The monumental instrument, the largest in France, was fully restored in 2013 with each pipe cleaned. Paris' deputy mayor, Emmanuel Gregoire, said the instrument remained intact following the fire. AFP/Getty Notre Dame fire: What was lost and what was saved Safe: Bells Housed in the two western towers, Notre Dame's bells have rung out at key moments in France's history. Emmanuel, the largest bell, was lifted into the south tower in 1685 and weighs over 23 tonnes. The fire was prevented from spreading to the bell towers. AFP/Getty Notre Dame fire: What was lost and what was saved Safe: Crown of Thorns Believed to be a relic of the wreath of thorns placed on the head of Jesus Christ at his crucifixion, the object was stored in the cathedral's treasury. French King Louis IX brought the relic, which is contained in an elaborate gold case, to Paris in 1238. The Crown of Thorns was saved and has been taken into safekeeping. AP Notre Dame fire: What was lost and what was saved Safe: Tunic of Saint Louis The tunic allegedly worn by Saint Louis IX as he brought the Crown of Thorns to Paris was kept inside the cathedral. It has been saved. AFP/Getty Notre Dame fire: What was lost and what was saved Safe: Statues on the roof The week before the fire, religious statues set atop the cathedral were removed for the first time in over 100 years as part of the restoration project. A 100-metre-high crane lowered the copper statues representing the 12 apostles and four evangelists onto a lorry. AFP Notre Dame fire: What was lost and what was saved Destroyed: Spire Crowds of tourists and Parisians watched in horror as the spire and roof of Notre Dame cathedral came crashing down to the ground. EPA/I Notre Dame fire: What was lost and what was saved Unknown: Choir screen It is not known what happened to the detailed choir screen at Notre Dame cathedral. AFP/Getty Notre Dame fire: What was lost and what was saved Some of the artworks from Notre-Dame sheltered as the fire devastated the cathedral AFP/Getty

Emmanuel Macron, the French president, committed to rebuild the church within five years, in a short public address on Tuesday.

He called for unity and said Notre Dame would be restored to be “even more beautiful”.

“We can do it and once again, we will mobilise,” he said.

Wealthy French benefactors have pledged hundreds of millions of euros to rebuild the famous building after its roof and spire were ravaged by the blaze.

On Tuesday night, monuments around the world were lit up in the colours of the French flag, in a show of solidarity with Paris.

One World Trade Centre, the dome of the Chapel of the Holy Shroud inside the Duomo in Turin and the La Fenice theatre in Venice, were among the monuments taking part in the global gesture.

If you would like to see how the Notre Dame fire unfolded, please see what was our live coverage below: