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. - E1 Z- p# t% M) j( q: @2 C! U5 t7 G, Y: K U. n6 ^& m
They say they are treating it as a "terrorist incident" as they investigate.