The United Nations Working Group on Enforced or Involuntary Disappearances (UN WGEID) visited families of the disappeared in Mannar on Friday.
The working group investigated the mass grave in Mannar that saw the skeletal remains of 81 exhumed when it was first found, reports Colombo Page.
The five member committee will tour the island before finishing its trip in Colombo.
The committee is expected to visit Kilinochchi and Jaffna over the next few days.
Families of the disappeared demonstrated outside the UN office in Jaffna on Thursday, calling for an an international probe into disappearance cases in Sri Lanka.