Police say that 19 people have been killed and another 50 injured after an explosion at the Manchester Arena in northern England, where U.S. pop star Ariana Grande was giving a concert. 3 R' p `; X! }- U1 n, ~8 y: q " z3 S m. a: D5 O3 G# q. _They say they are treating it as a "terrorist incident" as they investigate.