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. ) \8 ^' d: W/ [1 ^0 n ( \) \! e% |$ a* o) H8 T) Z6 t) Q. BThey say they are treating it as a "terrorist incident" as they investigate.