Mexican authorities set up emergency shelters and cruise ships shifted course on Tuesday as Hurricane Rina strengthened off the Caribbean coast on a projected track that would carry it whirling through Cancun and the resort-filled Mayan Riviera, Mexico's most popular tourist destination.

Rina's maximum sustained winds have increased to 105 mph (165 kph), said the U.S. National Hurricane Center in Miami, making it a Category 2 storm. Forecasters predict it will strengthen as it nears the Mexican coast Wednesday night before rolling over the island of Cozumel, a popular dive spot and cruise-ship port, then along the coast to Cancun.

The area, dotted with Mayan ruins, also includes Playa del Carmen, another popular spot for international tourists.

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