There were 2,186 homicides in May, said a report from the National Public Safety System -- the highest figure since the country began keeping track 20 years ago.
The deadliest state was Guerrero, in the south, a hotspot in Mexico's war on drugs where 216 people were killed.
In the western state of Sinaloa -- where rival factions have been battling for control of the Sinaloa drug cartel since its kingpin, Joaquin "El Chapo" Guzman, was extradited to the United States in January -- 154 people were killed, the highest number in six years.
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