A report in Papua New Guinea says police in Bougainville are trying to find out if five former Fiji soldiers are linked to a recent armed robbery in Solomon Islands.
Two Solomon Islanders working for the Kalena logging company were injured on Thursday last week when more than four Bougainvilleans held up the camp at gunpoint.
They stole a chainsaw, fuel and a canoe.
The Post Courier newspaper quotes a Bougainville source as saying police are investigating whether the men were trained by the Fijians.
Bougainville's acting assistant police commissioner, Paul Kamoi, told the Post Courier that the assailants were from Orava Village in Buin, south Bougainville.
Mr Kamoi said the men had crossed the border in a motorised dinghy before ransacking the logging camp.