Two PNG porters were hacked to death in the attack, which happened around dusk on Tuesday. The Australians and New Zealander - who live in NSW, Victoria and Queensland - were all assaulted. Four were hurt. "They have cuts and abrasions and are in shock," PNG Trekking boss Mark Hitchcock told News Corp. The group - who were on an organised walk with PNG Trekking - were setting up camp at dusk in the village of Banis-Donki, about 200km north of Port Moresby, when they were ambushed. Mr Hitchcock told News Corp Australia they had just arrived at their camp site after an all-day trek when the bandits emerged from the bush and attacked. The guides were set upon by men armed with knives and machetes. The Australians were assaulted and had all their belongings stolen. The group, in shock and many with injuries, then trekked back to Wau in the dark. They were met on the way by a group made up of locals and security men from Morobe Mining. Doctors were flown in from Lae to treat the injured. "We want to get them out quickly," Mr Hitchock said. We are deeply shocked by what happened. He said the worst-injured had been airlifted from Wau to Lae on Wednesday morning. The trekkers were expected to be flown to Port Moresby later on Wednesday or Thursday. The Department of Foreign Affairs and Trade has recommended trekkers avoid the Black Cat track.