The NGO, LNG Watch, says tribes in PNG's Hela are bringing in more guns to the area because they are unhappy with how they're being treated over Exxon Mobil's huge LNG project.
Australia's Prime Minister, Tony Abbott, is to be briefed on the project when he visits Papua New Guinea this week.
It is understood to be ahead of schedule in terms of delivering it's first cargo of liquefied natural gas this year.
LNG Watch's Stanley Mamu says ExxonMobil is not concerned with making landowners happy, and he believes tensions will boil over later on.
"There's more guns flooding into Hela, there will be a disturbance somewhere in the middle of the project, because I can see more guns coming in, the local landowners purchase more guns. If people bring enough guns I think there will be a disruption on the project."
Stanley Mamu of LNG Watch.