The government of the Caribbean coast state of Quintana Roo said that President Enrique Pena Nieto was scheduled to attend an ocean conservation conference in Playa del Carmen on Thursday.
The US travel ban was issued late on Wednesday and was later cited by the Canadian government in its own warning.
Samardzija said he went back to Playa del Carmen in January and he has "never felt unsafe" in the tourist destination.
Some tourist destinations have no warnings against them, including Mexico City, Cancun, and Los Cabos.
The embassy announced a similar advisory that restricted government employees from using ferry service between Playa del Carmen and Cozumel Island after officials discovered another explosive device on a different ferry on March 1.
The U.S. embassy didn't disclose further details.More news: Amazon to Drop Nest as Google War Escalates
The U.S. embassy in Mexico City updated its security alert for Mexico yesterday, saying the office will remain closed until further notice after officials "received information about a security threat".
All tourism and economic activities in Playa del Carmen continue in a normal manner and hotel occupancy at the resort city was at 80 percent, said the statement. Playa del Carmen's beaches and resorts have typically been a huge attraction for spring break travelers from the United States.
US government employees are now not allowed to travel to the area until further notice and some cruise lines have cancelled excursions that involve ferries in the area. "We encourage travelers to be aware of surroundings and exercise caution", Nauert said Wednesday night. "Avoid tourist ferries travelling in the region until further notice, be vigilant and monitor local media (including social media)".
Mexican authorities say the ferry incidents are under investigation, while local media reported officials are looking at several possible motives, including the possibility that people linked to the ferry company could have bombed the boat to collect an insurance policy.