
Residents have lived in the camps for nearly five decades, administered by the Polisario on Algerian soil.
The UN has long urged a census; Algeria has resisted a full registration of the population.
The camps are central to debates over who would vote in any referendum and over humanitarian aid.
Morocco invites camp residents to return to the southern provinces under its autonomy offer.
The Polisario, on Algerian territory near Tindouf.
No full UN census has been allowed, a long-standing point of contention.