CAIRO ? People weren't surprised when Sami Ben Said Kthir vanished from his hometown in Tunisia's southern desert and slipped across the border to join Islamic State in Libya. It did come as a shock that so many others went with him. Kthir, 27, disappeared three days ago from Remada with a group including two former soldiers and an air force pilot, according to a relative who asked to be identified only as Mbarka. The interior ministry said 33 people ages 16 to 35 are thought to be missing, including one woman. quot;Remada woke up to a mass exodus of its citizens to Daesh,quot; said Mbarka, using the Arabic acronym for the jihadist group. Located 250 miles south of the beach resort where...