The recent online threat of a mass stabbing at a K-pop group’s concert turned out to be a prank by an 11-year-old girl, local police said Friday. The child, whose identity has been withheld, posted an online threat Tuesday that claimed that she would stab fans gathered at a concert held at the Gocheok Sky Dome in western Seoul. Seoul Guro Police Station dispatched 39 officials to conduct an extensive search of ...