Isolated Peru tribe makes uncomfortable contact [summary on article I read]

The Mashco-Piro (The tribe’s name) People hare an isolated tribe that lives in the Amazon, they are a truly puzzling tribe to scientists. They predict that they’re strange behavior is caused from the low flying air craft or pollutants in the Amazon’s water. They act like our ancestors did, there is 2 reports of these people killing people with hand crafted arrows that were in their property. Men who took pictures and slightly documented these previously un-contacted Indians were soon shot and killed, one with severe injuries and the other had been fatally shot. The area they are on is slowly becoming less and less isolated. The wood and oil industries have made their business dangerously close to the wild tribe. The clan that showed up at the river is believed to number about 60, including some 25 adults. The situation is very delicate and scientists / environmental specialists are trying very hard to not upset these indigenous people because they are fully aware of the consequences if they do so. It’s nearly impossible to contact them because the only person who could contact with them 'Shaco' is now dead.