In pictures: Madrid's towering inferno

1 of 9 The Windsor Building blaze eerily lit up the Madrid night sky.

2 of 9 No-one is thought to have been inside the building at the time of the fire

3 of 9 Bars, restaurants and nearby buildings were evacuated as the fire intensified.

4 of 9 In the morning light, clouds of smoke hung over the capital as firefighters continued their efforts.

5 of 9 Firefighters take a break after spending the night battling the blaze.

6 of 9 It is now feared that the entire structure could be at risk of collapse.

7 of 9 Investigators must wait until Wednesday before they can enter the building.

8 of 9 Madrid's mayor has said the remains of the building will have to be demolished.

9 of 9 About 10,000 people must wait until the travel restrictions are lifted before they can return to work.