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. : r% H2 {5 D3 ?- }0 X( B7 @: Y
2 v8 g) H* T9 W3 e. g: U$ D7 ~They say they are treating it as a "terrorist incident" as they investigate.