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Image: Collapsed stage in Marseille, France
Elise Gardet  /  AP
The roof of a stage collapsed while being built for a Madonna concert at the Stade Velodrome in Marseille, France, on Thursday.
msnbc.com news services
updated 7/17/2009 2:17:53 PM ET 2009-07-17T18:17:53

Prosecutors have opened a manslaughter investigation in the collapse of a stage being built for a weekend concert by Madonna that killed two people, an official said Friday.

Eight other people were injured in Thursday's accident in the Mediterranean port city of Marseille, one of them in critical condition and four in serious condition, officials said.

Assistant prosecutor Marc Simamonti said an investigation by the prosecutor's office for manslaughter and involuntary injuries in a work-related accident has been opened. He said the initial hearings would be held Sunday or Monday.

An injured British worker died Friday, the Marseille hospital authority said. A French worker was killed immediately when a section of the stage roof at the Velodrome Stadium collapsed as it was being put into place.

Madonna was to perform on Sunday but canceled the engagement after the accident.

“I am devastated to have just received this tragic news,” Madonna said in a statement to Access Hollywood. “My prayers go out to those who where injured and their families along with my deepest sympathy to all those affected by this heartbreaking news.”

None of the victims' identities has been released, but the prosecutor said all the remaining injured are French. An earlier report that an American had been seriously injured apparently was inaccurate.

The cause of the roof collapse was not known. Police said a faulty power winch may have played a role.

© 2013 msnbc.com

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