A swastika was discovered spray-painted on a wall next to the nation’s oldest Holocaust memorial in Philadelphia, sparking a vandalism probe. The hateful symbol, measuring about 2 feet by 2 feet, was spotted early Sunday on the wall of the Verizon building on Arch Street adjacent to the Horowitz-Wasserman Holocaust Memorial Plaza, police said. Surveillance video caught a masked man quickly scrawling the Nazi insignia with green spray paint around 1:30 am, according to the authorities. The suspect was described in a police press release as an “unknown male” who was last seen wearing a dark, possibly brown, jacket with...