That's awful. I don't know either. Surely they aren't prisoners, they aren't guilty of anything or under suspicion? What law is being used to detain them? Some of them are adults so should be free to go where they please? And those that aren't should be released to their parents' care.
There was some fear that they would be rejected by their families, usually because they are not virgins any more or in some cases because they have been forcibly converted to Islam, if they were previously Christian. No sign of that as a fear in that story though.
The security guard deleting all the man's photos is odd too? I'm assuming all the girls/women have been identified and the families know if their daughter/whoever is there so why would photos not even allowed?