The collapse occurred at the Velodrome stadium where Madonna was going to perform on July 19. We're told the roof of the stage collapsed on top of the workers. Fire officials in Marseille tell us two of the injured workers are in critical condition -- one is an American.
French papers say the concert has been canceled.
UPDATE: Madonna has issued the following statement: "I am devastated to have just received this tragic news. My prayers go out to those who were injured and their families along with my deepest sympathy to all those affected by this heartbreaking news."
UPDATE: A second man is now being reported as dead.