A number of cruise lines dropped Mazatlan from itineraries last year following a spike in violence.
Puerto Vallarta has remained a tourism hotspot, drawing college students during Spring vacations as well as cruise passengers.
The travel warnings follow reports that more than 47,500 people were killed in drug-related violence in Mexico between December 2006 and September 2011,
http://www.cnn.com/2012/02/26/world/mexico-cruise-robbery/index.html
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