A blast last month on a tourist ferry in the Mexican beach resort of Playa del Carmen was caused by "an explosive device" that injured passengers, including U.S. tourists, the U.S. embassy in Mexico said on Thursday. A security alert posted on the embassy's website warned American citizens to exercise caution and said Mexican authorities continued to investigate the blast. Two more explosive devices were found attached to another ferry on the island of Cozumel on Thursday, local media reported, saying marine troops had secured the scene.



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