(CNN) -- An isolated Indian tribe in Brazil seemingly has vanished like a morning mist in the Amazon jungle.
Concerns are rising that the tribe, filmed this past year for the first time, may have been run off by drug traffickers.
Aid group Survival International first reported this week that suspected traffickers had destroyed a Brazilian guard post built near the tribe's location to protect them from outsiders. The organization said it was feared that a nearby river has become a transit point for cocaine from Peru.
An overflight of huts where the tribe lives showed no one in the area, Bruno Perez, a spokesman for Brazil's National Indian Foundation (FUNAI), told CNN Thursday.