A Jewish human rights group that reported an anti-Semitic attack on Orthodox schoolchildren in Chicago on the anniversary of a Nazi pogrom was forced to defend its statements Friday after a city official denied the ambush was anti-Jewish in nature. The Simon Wiesenthal Center (SWC), a global NGO dedicated to Holocaust research, originally issued a statement Thursday describing a disturbing attack on a school bus carrying youngsters from a Jewish academy in the West Rogers Park neighborhood on Wednesday. “At one stop, four men jumped onto the bus, hurled anti-Semitic slurs, and performed the Heil Hitler salute at terrorized children,”...