GUATEMALA   Guatemalan drug boss Juan Jose "Juancho" Leon was summoned by Mexican traffickers for what he was told was business. Instead, dozens of attackers ambushed his entourage with grenades and assault rifles, killing Leon and 10 othersthis was a set up and a brazen demonstration of power.

mexican drug cartels are branching out as never before  spreading their tentacles into 47 nations, including the U.S., Guatemala and even Colombia, long the heart of the drug trade in Latin America.

The expansion comes amid a military crackdown in Mexico and the arrests of major Colombian suppliers and poses a new challenge for efforts to stop the flow of drugs into the United States.

In dozens of interviews with officials and experts in seven countries, The Associated Press found that the Mexican mobs increasingly buy directly from the cocaine-producing Andes and have begun using countries as distant as Argentina to obtain the raw material for methamphetamine. Mexican gangsters have been arrested as far away as Malaysia as they seek new markets for cocaine and "meth" supply sources.We have evidence of Mexicans sitting in Medellin, sitting in Cali, sitting in Pereira, in Barranquilla," he told the AP.

In neighboring Peru, the world's No. 2 cocaine producing country after Colombia, Mexican traffickers are bribing customs officials at airports and seaports and laundering money by investing in real estate. At least four major mexican cartels  now buy cocaine directly in Peru, said Sonia Medina, chief public prosecutor for drugs and money laundering.