The warnings come after a bomb exploded on a ferry that runs between Playa del Carmen and Cozumel in February and an unexploded ordinance was found on another ferry a week later.
One week later, an "apparent explosive device" was found on a Barcos Caribe ferry in Cozumel, Mexico, according to the Playa del Carmen state prosecutor.
Tourists enjoy the beach at the Playa del Carmen in Quintana Roo state, Mexico, on March 28, 2017.
The alert included an indefinite ban on travel to Playa del Carmen by US government employees.
That warning was triggered by an explosion aboard a ferry in Playa del Carmen.
Initial reports had indicated the explosion was caused either by a gas leak or engine failure, but a security alert posted on the U.S. Embassy website the blast was caused by an explosive device.
Mexican officials contested the alert, saying in a statement "all tourism and economic activity in Playa del Carmen continues in a normal manner".
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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.
"Mexico is by far the most popular sun destination among our clients but, of course, if someone is feeling uncomfortable travelling anywhere, we can always find them somewhere else to go", Wallace said.
"According to Government of Mexico statistics, the state experienced an increase in homicide rates compared to the same period in 2016", the warning for Quintana Roo states.
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.
Both incidents are still under investigation.
Last week four gunmen burst into a hospital in Cancun and shot to death a drug gang suspect and his wife.