Police have confirmed a "number of fatalities" following reports of an explosion at Manchester Arena. Witnesses reported hearing a "huge bang" following an Ariana Grande gig at Manchester Arena. Explosion seen in the left side of the image: #ManchesterArena incident during #ArianaGrande concert, casulties confirmed (LIVE UPDATES) https://t.co/A3Lo6RMt5s pic.twitter.com/Gxm1V8A8gw — RT (@RT_com) May 22, 2017 Network Rail said train lines out of Manchester Victoria station, which is close to the concert venue, were blocked. Greater Manchester Police tweeted to urge people to stay away from the area. 'Screaming and running' #ArianaGrandeConcert She's ‘OK’ After Explosion at #ManchesterArena Trying To Confirm 20 Dead..abc11.com/2024356/ pic.twitter.com/uq2vWyKW2b — Right Voice Now (@rightvoicenow)…