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. 9 t8 B# v, E9 T' G) q4 B; K
0 K2 k/ O& E; t# @. v; {They say they are treating it as a "terrorist incident" as they investigate.