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. 2 P0 c1 P) @7 I# r5 X; j$ O- h1 p* x) ~4 e8 z) P! f* h( _
They say they are treating it as a "terrorist incident" as they investigate.