this 21,000 seat arena, relatively new one opened in the mid-90s is the victoria street to the next train station. basically one building a joins the next, from people outside of anyone who might've been attending the concert. perhaps a lack of security going into the concert and some focused on the area inside the concert area. it might not be necessary to understand what is going on here. again, the arena connects with the train station in manchester and the explosions appear to come from what they call the foyer area next to the main concert hall, and that's where the explosions came from but