Several women and children were among the victims, whose throats were cut.
At least 28 people were
reported killed in Mexico in the past 24 hours, including seven whose bodies were found in a vehicle in the Pacific resort city of Acapulco.
Threatening messages were left with the severed heads - a common feature of killings by drug cartels in Mexico.
The Zetas and Sinaloa have emerged from years of Mexican drug wars as the largest cartels in the nation.
Mexican President Felipe Calderon said the US` practice has fuelled violence in Mexico`s border areas.
This hiring tactic was first used by the Mexico`s brutal Zetas drug gang.
Record drug seizures and other blows have weakened criminal organisations.
Mexican officials warn there likely will be more bloodshed in coming months.
Jose Francisco Blake has been appointed as Mexico`s new interior secretary.
Three Mexican cartels have joined forces to destroy a gang of hit men that has grown into a feared drug trafficking outfit with reach into Central America.
Thirteen Mexicans have been arrested for building a clandestine tunnel, which was equipped with an elevator, under the border with the US, authorities said.
At least 17 people were killed over the weekend in Mexico`s northern state of Chihuahua, including a women`s rights activist in Ciudad Juarez, on the US border, local officials said.
Mexican President Felipe Calderon said on Wednesday that the top priority in the second half of his term will be reducing poverty, after the war against drug cartels took centre stage in the first three years of administration.
The United States has placed 50 suspected Afghan drug traffickers with ties to the Taliban on a Pentagon target list to be captured or killed, The New York Times reported on Monday.
Mexican drug gangs are killing rivals in record numbers in a major setback for the government, which will seek more support from US President Barack Obama when he visits the country this weekend.
Day in Pics: 20th September
Showbiz World - September 20, 2014
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