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fficials in the island nation of Mauritius blocked a Norwegian Cruise Line ship from docking there Sunday after more than a dozen passengers were stricken with a stomach illness. Around 15 passengers aboard the Norwegian Dawn remain in isolation because of an undisclosed "health risk" and are undergoing testing, according to the Mauritius Ports Authority. "The decision not to allow the cruise ship access to the quay was taken in order to avoid any health risks," the authority said in a statement. The sick guests “experienced mild symptoms of a stomach-related illness,” Norwegian Cruise Line said in a statement Sunday. The cause of the outbreak has not been released. “Due to additional testing being required by local authorities before being allowed entry, the government of Mauritius has delayed disembarkation for the current cruise and embarkation for the next cruise by two days,” the Norwegian statement said. It’s expected that the ship will be allowed to dock Tuesday, the cruise line said, after results of tests conducted Sunday become available.