The team from UN Working Group on Enforced or Involuntary Disappearances comprises Chair-Rapporteur Olivier de Frouville and member Osman El Hajje.
Pakistan is working "vigorously" on reports of people going missing in the country, an official said.
Peshawar High Court Chief Justice Dost Muhammad Khan asked the agencies to free all those in their custody "for years" within 15 days.
Day in Pics: 28th August
August 28, 2014
Bipasha at launch event for Delhi Half Marathon