Most of the others have since returned to Morocco, but a few thousand remain, according to the Ceuta government. Since he was last seen in the Moroccan border town on Fnideq that day, nobody has been in contact with him, his sister Mariem says. Omar has tried to cross into Ceuta with a friend, who also hasn’t been heard from, Mariem told CNN. Missing minorsThe Ceuta government estimates that of the thousands of migrants that remain, more than 800 are minors. Fourteen-year-old Nada Shiba was also headed to the Ceuta border crossing with her mother when they got separated and the young teen went missing, her uncle Yousef told CNN.