"While most of these homicides appeared to be targeted criminal organization assassinations, turf battles between criminal groups have resulted in violent crime in areas frequented by USA citizens", the warning said.
Here's what you need to know about the latest Mexico travel warning.
"Travelers should be mindful that even if no advisories are in effect for a given state, USA citizens should exercise caution throughout Mexico as crime and violence can still occur", the warning says.
The U.S Department of State has issued a travel warning to citizens planning on traveling to Mexico, adding Quintana Roo to its list. The only warning for Quintana Roo in a December statement was about lack of cellular and Internet service in some areas. While most of these homicides appeared to be targeted, criminal organization assassinations, turf battles between criminal groups have resulted in violent crime in areas frequented by USA citizens. The violence has led to innocent people being killed as bystanders, the Los Angeles Times reported.
There have been deadly gun battles in downtown Cancun, and in January, five people were killed at a nightclub in nearby Playa del Carmen. The Gulf Coast state of Veracruz and southern state of Chiapas are also new additions. In Nayarit, which includes the Riviera Nayarit coast, US government personnel are allowed to travel using major highways, but intercity travel at night is prohibited.
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A warning for Baja California Sur - which includes Los Cabos - said criminal activity and violence is occurring throughout the state.
According to the Baja California State Secretariat for Public Security, the state of Baja California experienced an increase in homicide rates compared to the same period in 2016.
Citing Mexican government statistics, the State Department noted on Tuesday that so far 2017 has seen much higher rates of violence in those regions than during the same period past year.
The agency cautioned US citizens that homicide rates are on the rise in areas such as the states of Quintana Roo, which includes Cancun, and Baja California Sur, which is home to Los Cabos. Travelers are urged to use caution in all areas of Mexico, even if no advisory is in effect for a particular area.
Mexico City remains without an advisory.