Six men have appeared in court in Papua New Guinea over the attack on a group of New Zealand and Australian trekkers and their porters in September.
Police in Morobe province arrested the men in the wake of the attack on the trekking group on the Black Cat Track on 10 September.
Two porters were killed and New Zealander Nick Bennett was hit on the head with a rifle butt. Some of his Australian companions were also injured.
Another porter later died in hospital of machete wounds.
The six accused appeared in court in the provincial capital, Lae, each charged with three counts of murder.
The ABC reports that the men have also been charged with attempted murder, grievous bodily harm and armed robbery.
The accused were remanded in custody until December.