frankfurt german authorities arrest suspect child sex abuser tuesday take extraordinary step circulate photograph 4-year-old victim find dark web prosecutor say bild newspaper say suspect identify monday even child mother saw image post online show television go local police station man identify media woman 24-year-old boyfriend detain hours nationwide manhunt begin frankfurt prosecutor georg ungefuk say tuesday judge approve arrest warrant send suspect pre-trial detention spokesman prosecutor office say man apartment wesermarsch district low saxony search evidence seize officials say suspect believe seriously sexually abuse child total nine time make film abuse distribute ungefuk say face possible prison sentence 15 years convict multiple count sexual abuse accord prosecutor office experts work case since image abuse first appear dark web part internet accessible via search engines late july say authorities take unusual step distribute photograph run options authorities tip case foreign officials identify germany likely location crime since german television program could hear background one videos ungefuk say link case elysium platform child pornography network 90,000 users whose suspect operator arrest july prosecutors hanover take case give allege crime take place low saxony state german police arrest man post photo child abuse victim