A group of policemen ride a truck on their way to search the area where left guerrillas kidnapped 53 people September 18, 2000. Marxist rebels who seized up to 53 people in a mass kidnapping outside Colombia's second-largest city have freed 15 of their victims, including an American woman, as they fled in the face a huge search-and-rescue operation, authorities said on Monday. Cuban-inspired National Liberation Army (ELN) guerrillas nabbed the hostages on Sunday, after erecting makeshift roadblocks along a stretch of highway lined with popular eateries and weekend homes in the Andes mountains about 11 miles (18 km) northwest of Cali.