On 15 April 2019 the cathedral caught fire, destroying the flèche and the "forest" of oak roof beams supporting the lead roof.It was speculated that the fire was linked to ongoing renovation work.The fire broke out in the attic of the cathedral at 18:18, investigators concluded. The smoke detectors immediately signalled the fire to a cathedral employee, who did not summon the fire brigade but instead sent a cathedral guard to investigate. The guard was sent to the wrong location, to the attic of the adjoining sacristy, and reported there was no fire. About 15 minutes later the error was discovered and the guard's supervisor told him to go to the correct location. The fire brigade was still not notified. By the time the guard had climbed the 300 steps to the cathedral attic, the fire was well advanced.The alarm system was not designed to automatically notify the fire brigade, which was summoned at 18:51 after the guard had returned from the attic and reported a now-raging fire, and more than half an hour after the fire alarm had begun sounding. Firefighters arrived in less than ten minutes.The cathedral's flèche collapsed at 19:50, bringing down 750 tonnes of stone and lead. The firefighters inside were ordered down. By this time the fire had spread to the north tower, where the eight bells were. The firefighters concentrated their efforts in the tower. They feared that, if the bells fell, they could wreck the tower, and endanger the structure of the other tower and the whole cathedral. They had to ascend a stairway threatened by fire, and to contend with low water pressure for their hoses. As others watered the stairway and the roof, a team of 20 firefighters climbed the narrow stairway of the south tower, crossed to the north tower, lowered hoses to be connected to fire engines outside the cathedral, and sprayed water on the fire beneath the bells. By 21:45, they brought the fire under control.