The bodies of 15 aid workers killed in Sri Lanka in August are to be exhumed to try to find out who killed them.
Two of the 17 aid workers' bodies were exhumed in September
The local staff of the Paris-based Action Against Hunger group were found killed in their office in Muttur.
The town had been the scene of heavy fighting between government forces and Tamil Tiger rebels.
The Norwegian mission monitoring Sri Lanka's ceasefire has blamed government troops for the killings. The government has denied responsibility.
An initial post-mortem was inconclusive.
Action Against Hunger said Australian experts would observe the latest autopsies, scheduled for next week in the capital Colombo.
Two of the 17 aid workers killed in August have already been exhumed and are being kept in Colombo awaiting examination.
Renewed fighting between government troops and Tamil Tiger rebels has broken out in Sri Lanka's northeast in recent days, threatening to derail peace talks set for later in October in Geneva, Switzerland.