Government anthropologists will try to talk with a clan of Mashco Piro Indians to understand why they have been emerging from the forest, said deputy culture minister Patricia Balbuena.
In recent years the Mashco Piro have increasingly been spotted seeking machetes and food outside their jungle enclaves in the Manu National Park in southeastern Peru.
Villagers, Christian proselytizers and tourists have all interacted with the tribe, often giving them clothes and food.
"The only ones who haven't been in contact with them are representatives of the state," said Balbuena.
Peru prohibits contact with the Mashco Piro and another dozen "uncontacted" tribes, mainly because their immune systems carry little resistance to common illnesses.
Peru prohibits contact with the Mashco Piro and another dozen 'uncontacted' tribes, mainly because their immune systems carry little resistance to common illnesses
Authorities have said they cannot keep people from defying the contact ban because no penalty is attached.
Indigenous group FENAMAD warned that the decision to contact the Mashco Piro could legitimize the kind of unwanted interactions that have decimated isolated tribes in the past.
"Authorities should restrict boat transit and keep people from approaching," said FENAMAD president Klaus Quicque.
Luis Felipe Torres, the head of the state isolated tribes team, said the government would not forcibly contact the Mashco Piro or try to change their nomadic lifestyle.
"But we can no longer pretend they aren't trying to make some sort of contact," Torres said. "They have a right to that, too."
The Mashco Piro have historically rejected outsiders, surviving enslavement during Peru's bloody rubber boom in the late 1800s and later rebuffing missionaries.
But in the past year, the Mashco Piro have appeared in populated areas more than 100 times, especially along the banks of a river where they gesture to passersby, said Balbuena.
Not all interactions with outsiders have been peaceful.
In May, a group of Mashco Piro attacked the native Machiguenga community of Shipetiari, killing a young man with an arrow.
In 2011 the Mashco Piro killed another local man and wounded a park ranger with arrows.
Using interpreters of Yine, a native language similar to the Mashco Piro tongue, the government hopes to prevent future clashes, Balbuena said.
A team of doctors six hours upriver would treat the tribe if disease breaks out, Balbuena said.