A stage being constructed for a concert by pop star Madonna in France has collapsed, killing one person and injuring six, police say.

Technicians were setting up the stage at the Velodrome stadium in Marseille when the accident occurred at around 1715 (1515 GMT).

The concert, planned for Sunday, 19 July, has now been cancelled, officials announced.

It was part of the European leg of the Madonna’s Sticky and Sweet tour.

The cause of the accident was not clear.

The frame "started shaking and collapsing", said Marseille city councillor Maurice Di Nocera.

"Fortunately, it didn’t collapse too quickly, as there would have been quite a few victims," he said, according to AFP news agency.

Two of the injuries were serious, Interior Minister Brice Hortefeux said.

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