Fires burn in the Amazon forest near Apiau, Brazil, Monday. A severe drought blamed on El Nino has caused at least 600,000 hectares to catch fire. The 3-month-old fire in northern Amazon is blazing out of control, lapping at the forest home of the Yanomami Indians, the world's largest Stone Age tribe. Officials say the blaze reached 12 miles into the reservation but wouldn't say how much of the forest has burned. Heavy smoke and low rivers have hindered access to the region.