(2nd LD) crime threats-arrest (2nd LD) Police intensify investigation into surge of copycat crime threats following stabbing rampage(ATTN: UPDATES figure in paras 4,11-13) SEOUL, Aug. 5 (Yonhap) -- Police intensified their investigation Saturday into a wave of online posts threatening copycat crimes following a recent stabbing rampage at a department store. On Thursday afternoon, a man drove a car onto a sidewalk and attacked people with a knife at a department store in Seongnam, south of Seoul, leaving 14 people wounded.

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