Four members of the FBI have visited Papua to ask about an Indonesian police probe into the ambush killing of two Americans and an Indonesian in August.
The Papua police chief, Made Mangku Pastika, says they were not investigating but wanted to get information and maybe offer ideas about things not yet done.
The AAP news agency says the visit marks the second time the FBI has visited Papua to monitor the case.
The US has described the killings as a terrorist act which the Indonesian military has balmed on separatist rebels.
But a Papuan Human Rights group alleges soldiers from the army's Kopassus special forces were implicated in the killings.
The US plans to resume military assistance to Indonesia but the so-called Leahy Amendment suspends this until certain conditions are met, including measures to bring to justice members of the armed forces and militia groups suspected of rights abuses.