Suspected Peruvian drug traffickers have destroyed a guard post protecting a recently discovered indigenous tribe in Brazil's Amazon rain forest, the aid group Survival International reports.

Aerial film and still images of the tribe were first shown to the world in February. The Brazilian government's National Indian Foundation established the guard station near the tribe's territory along Brazil's border with Peru to protect the Indians from outsiders.

Survival International said Monday that Brazilian authorities can now find no sign of the tribe.

"We think the Peruvians made the Indians flee. ... We are more worried than ever. This situation could be one of the biggest blows we have ever seen in the protection of uncontacted Indians in recent decades. It’s a catastrophe," Carlos Travassos, the head of Brazil's isolated Indians department, said in a Survival International statement.

Survival International reports the tribe's lands are near the Envira River, which Peruvian cocaine smugglers reportedly use as a route into Brazil.

Brazilian authorities report groups of men armed with machine guns and rifles are in the nearby forest, according to the aid group.

Authorities had recovered a drug trafficker's rucksack with a broken Indian arrow in it, Survival International reported.

"This is extremely distressing news. There is no knowing how many tribal peoples the drug trade has wiped out in the past, but all possible measures should be taken to stop it happening again. The world’s attention should be on these uncontacted Indians, just as it was at the beginning of this year when they were first captured on film," Survival International Director Stephen Corry said in a statement.