UPDATE 4-Cruise ship has 60 flu cases, company says no H1N1

* French authorities say 60 infected with swine flu on ship

* Ship owner Royal Caribbean says tests were negative

* Shares in Royal Caribbean slip

(Adds passengers not allowed to disembark in Marseille)

By Sophie Hardach

PARIS, July 31 (Reuters) - A cruise ship carrying dozens of possible flu victims among its 5,000 passengers and crew docked in France on Friday, and there were contradictory reports about whether they had H1N1 or more common flu-like symptoms.

French authorities said in a statement on Friday morning that the ship had arrived in Villefranche in southern France carrying 60 people infected with the H1N1 strain of flu, also known as swine flu.

They said their information was based on what Spanish authorities had told them.

The Spanish Health Ministry in Madrid said one person who had shown flu-like symptoms had been tested and confirmed positive for H1N1 after the ship left Barcelona on July 26.