The number of murders in Mexico rose by nearly a quarter in 2010 compared to the year before as the drug war intensified across the country, Mexican statisticians said.
The National Institute of Statistics and Geography recorded 24,374 homicides over the course of last year, a 23% increase from 19,803 in 2009.
Last year's figure represented 22 killings for every 100,000 residents in the country.
Many but not all of the homicides were committed by organised crime organisations, the institute said.
Violence has risen in many Mexican regions as a result of drug trafficking and other organised criminal activity.
President Felipe Calderon's office has said that more than 15,000 homicides in 2010 were attributed to organised crime.
According to the statistics institute, the US-bordering state of Chihuahua saw the highest number of homicides with 4,747. Sinaloa, in north western Mexico, registered 2,505.
Sinaloa is the headquarters of the Sinaloa cartel, while Chihuahua includes the violent border city of Ciudad Juarez.
Those two states are among the most affected by drug violence, and together they accounted for 29% of Mexico's homicides.
The institute cautioned that its information was preliminary and said it awaited definitive results that are to be released in September.