The foreign affairs ministry has been instructed to discuss with that country and get them released, he has told BBC Sandeshaya.
Responding to a latest programme aired by Channel 4 television, Paranagama stressed that there was no truth to claims that 40,000 civilians had died in the final stages of the war.
Foreign expertise, if needed
He also said the commission has recommended a fully local mechanism, with foreign technical expertise if needed, to investigate war crimes charges.
In an interview with BBC, president Maithripala Sirisena has rejected foreign participation in the process.
However, prime minister Ranil Wickremesinghe has told C-4 that foreign involvement has not been ruled out.
Paranagama went on to say that the commission received 300 more complaints about disappearances during sittings in Jaffna recently.
With the appointment of two more commissioners, the activities of the commission have been expanded, he said.
A protest took place in the north on Thaipongal day against a remark by the PM that most of the war missing were believed dead by now.
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