Reports in Papua New Guinea say the government has details of incursions across the border by armed Indonesia soldiers earlier this month.
The Post Courier newspaper says residents of six villages along the Torasi River have left their homes, after threats from the soldiers.
The paper reports that in the first incident, on the 11th of February, Indonesians in civilian clothing, but thought to be soldiers, went into Balamuk village which is about 27 kilometres from the border.
The Indonesians questioned the village's ward councillor.
In the second incident, the following day, Indonesians in full military uniform and armed, travelled up the Torasi River on a highpowered boat that was flying the Indonesian flag.