A Colombian soldier checks a car as two Colombian citizens look on at the San Miguel bridge on the border between Ecuador and Colombia March 6, 2008. Latin America's leftist leaders heaped more criticism on Colombia, leaving it increasingly isolated on Thursday in a crisis that has threatened political stability in the Andes. Colombia, the United States' closest ally in South America, set off a major diplomatic crisis on Saturday when its army crossed into Ecuador to kill Colombian Marxist guerrillas just across the border. REUTERS/Guillermo Granja (ECUADOR)