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 ~! v3 g4 K' M2 }7 t6 x0 q
0 e z: N* R. k6 d& \They say they are treating it as a "terrorist incident" as they investigate.