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. 6 y+ F* K4 X4 ?* n; D/ t
, P7 _( H5 W; L* ?( P, M# m1 M6 ^They say they are treating it as a "terrorist incident" as they investigate.