Officials identified the fugitive, whom they are calling “Izan,” during this week’s questioning of Chinese-born Yusufu Mieraili, who has apparently confessed to handing the explosives to the yellow-shirted man seen on CCTV cameras depositing a black backpack at the popular tourist site. Mieraili was arrested during a raid at a residence in east Bangkok late last month during which an assortment of bombmaking equipment and fake travel documents were also seized.