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 T3 s+ E) D4 ~8 r' y$ x
5 W# ~& \% R4 ]% d% l. h9 s- P YThey say they are treating it as a "terrorist incident" as they investigate.