Three Canadians were among 26 people injured when an explosion ripped through a tourist ferry in Playa del Carmen as it unloaded passengers on February 21.
The United States has closed its consular agency in Playa del Carmen, Quintana Roo, and ordered government employees not to travel to the popular tourist destination due to a security threat.
Specific details about the threat were not released, but the embassy advised USA citizens in Playa del Carmen to be aware of their surroundings and to exercise caution.
The U.S. Embassy issued a travel warning for a resort in Mexico following a ferry explosion.
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"All tourism and economic activity in Playa del Carmen continues in a normal manner", the government of Quintana Roo state said in a statement, noting that hotel occupancy at the resort was 80 per cent.
The alert focuses on Playa del Carmen, located on the country's east coast near Cancun.
The security alert coincides with the 2018 World Ocean Summit, which is taking place in Playa del Carmen from Wednesday through Friday, though it's unclear whether the two are linked. A day earlier, a shooting at a music festival in Playa del Carmen left three foreigners and two Mexicans dead.
This prohibition applies only to government officials but leisure travelers were urged to be aware of their surroundings and exercise caution while visiting the city. That incident came about a week after an explosive device detonated on another ferry, injuring several passengers.
In January, the U.S. State Department had warned of the escalating violence, listing parts of Mexico under its new Level 4 category - a risk level assigned to the most unsafe places on Earth, including Iraq and Syria.
Last week, four gunmen burst into a hospital in Cancun and killed a suspected drug gang member and his wife and, in 2017, four people were killed when a gunman attacked the state prosecutors' office in Cancun.