The most lethal weapons used by drug cartels in Mexico are smuggled from Central America, not from the United States, according to U.S. Embassy cables unveiled by WikiLeaks, reported La Jornada, a leading newspaper in Mexico City.

The U.S. Embassy in Mexico City reportedly wrote the cables following three bilateral conferences on firearms trafficking that took place in Mexico between March 2009 and January 2010.

The cables from the U.S. Embassy in Mexico City to the State Department in Washington, D.C., reported that lethal weapons, including anti-tank firearms and grenades, were stolen from military forces in Central America and then smuggled into Mexico through the Guatemala border, reported  La Jornada on Mar. 29.