News Americas, MEXICO CITY, Mexico, Mon. July 11, 2011: Some 1,800 additional federal agents have been unleashed in Mexico following a weekend that left at least 41 people dead.

The reinforcements were backed by 170 vehicles, 15 ambulances and 4 MI and Black Hawk helicopters, the Public Safety office announced and sent to Michoacan state to take part in a battle against the Knights Templars, a splinter group of the La Familia cartel.

Officers in the northern city of Torreon said on Saturday that they had found the headless bodies of seven men and three women in the back of an abandoned pick-up vehicle. The decapitated bodies were discovered hours after 20 people were killed late on Friday when assailants attacked a local bar in Monterrey, located in the north and the country’s second richest city.

At least 41 people were killed over the weekend, including 10 who were beheaded.

Some 37,000 people killed since it started a military offensive against the cartels in December 2006.