WASHINGTON (Reuters) - The U.S. government blamed Colombian guerrillas for the kidnapping of eight Canadians, three Spaniards and an American last weekend in Ecuador. A senior State Department official said the Revolutionary Armed Forces of Colombia (FARC) were behind the abduction and had shown they were unwilling to negotiate peace in good faith with Colombia‘s government. Armed men in combat fatigues kidnapped one American and seven Canadian oil workers, employees of Alberta-based United Pipeline Systems, on Saturday in the jungle where northern Ecuador borders on Colombia. They also seized one Canadian and three Spanish tourists and killed an Ecuadorean soldier guarding the oil workers. The FARC, Latin America‘s oldest leftist insurgency, controls 40 percent of the Colombian countryside. It has not claimed responsibility for the kidnapping. But for U.S. officials, the abduction was new proof that Colombia‘s guerrilla uprising has begun to spill over into neighbouring countries, threatening regional stability. Peace negotiations begun by Colombian President Andres Pastrana have stalled, with the FARC refusing to accept international monitors in a demilitarized zone the size of Switzerland. U.S. officials say the guerrillas have become increasingly involved in drug trafficking to finance their uprising in Colombia, the world‘s largest producer of cocaine and the source of much of the heroin sold in the United States. Colombian Foreign Minister Guillermo Fernandez met with Secretary of State Madeleine Albright on Thursday to discuss the new strategy.