Conflicting groups have become embroiled in "turf battles," and shootings between the groups have resulted in the deaths of innocent bystanders, the Los Angeles Times reported. According to the State Department, many of the gun battles occur in public places during broad daylight.
The State Department said U.S. citizens have also been kidnapped and murdered during carjackings and robberies.
According to the Los Angeles Times, a military-led drug war in Mexico is spurring violence across the whole country, which is on track to record more homicides in 2017 than it did in the preceding 20 years. An increase in demand for heroin from U.S. citizens has also spurred violence and conflict between drug cartels, the Times reported.
Read more at the Los Angeles Times and the U.S. Department of State.
Find details on which Mexican regions have safety advisories in effect here.