The U.S. government on Wednesday issued a security alert for the Mexico resort town of Playa del Carmen and closed its consular agency there.

The alert may have been triggered by a Feb. 21 explosion on a tourist ferry that injured 19 Mexican citizens and at least five U.S. citizens, according to the Associated Press. The AP also reported that undetonated explosive devices were found last week on another vessel owned by the same ferry company.

"The U.S. Embassy in Mexico City received information about a security threat in Playa del Carmen, Quintana Roo, Mexico," said the U.S. Embassy and Consulates in a statement. "Effective immediately, U.S. government employees are prohibited from traveling to Playa del Carmen until further notice. The U.S. Consular Agency in Playa del Carmen will be closed until further notice."

The U.S. embassy didn't disclose further details.

The Quintana Roo state government said, "All tourism and economic activity in Playa del Carmen continues in a normal manner."

Playa del Carmen is the closest resort town to the island of Cozumel and about 40 miles southwest of Cancun.

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