SD Gunadasa, an official of the commission, said the panel's hearing in Kilinochchi would take place from September 18 to 22. The first hearing in the area was held in January.
The official said the new complaints received from Kilinochchi will be probed and public statements will be recorded during the four days of hearings.
So far the commission, set up by President Mahinda Rajapaksa in August 2013 and mandated to probe the all disappearances of individuals between 1990 and May 2009, has received over 16,000 complaints from the families of persons reported missing, and 5,000 complaints from the families of the government troops.
The Sri Lankan President last week named Indian rights activist Avdhash Kaushal and Pakistan lawyer Ahmer Bilal Soofi to the earlier three-member panel of foreign advisers.
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The other three members of the experts' panel are British lawyer of Sri Lankan-origin, Desmond de Silva, and Geoffrey Nice, and US law professor David Crane, all former UN war-crimes prosecutors.
Sri Lanka came under international pressure to for the panel after UN Human Rights Council adopted three successive resolutions since 2012 over alleged rights abused by its forces during the final phase of the military offensive against the Liberation Tigers of Tamil Eelam which ended in 2009.