More countries have joined Australia in warning their citizens of travels to Papua New Guinea because of law and order problems.
New Zealand, United States and Canada says there is rising crime and election-related violence.
Polling is to get under way at the end of the month.
The advisories warn of problems in the highlands provinces, and warn against all travel to the Southern Highlands and Enga provinces.
The US says carjackings, armed robberies, and stoning of vehicles are problems in and around major cities such as Port Moresby, Lae, Mount Hagen and Goroka, but can happen anywhere.