Long And Complex News Today

And all around us, dark ash. andre finot is an official at the cathedral. >> there is no more roof. no more roof. the roof has disappeared. and some water leakage is downstairs. and just a nightmare. >> reporter: tonight, the timeline of the disaster coming into focus. a fire alarm sounding at 6:20 p.m. inspectors search the building but find nothing. 23 minutes later, another alarm. that time, they see the flames, but its too late. that 23-minute gap now part of an investigation authorities say...