Technicians had been setting up the stage at the Velodrome stadium in Marseille when the partially-built roof fell in, bringing down a crane.

A French worker, 53, was killed and two of those hurt, a Briton and a US citizen, were seriously injured.

Madonna said she was “devastated” by news of the accident.

The concert, planned for Sunday, was cancelled.

The 60,000-seater Velodrome is France’s second-biggest sports arena and home to the Olympique de Marseille football club.

Fire-fighters said the accident occurred when the roof of the stage became unbalanced as it was being lifted by four cranes, toppling one of the cranes which crashed on to the structure below.

Madonna Stage Collapse Photos