It's kind of hard to describe the layout of the arena.
The arena was basically built on top of Victoria Train Station. You can access the southern entrance / exit point to the arena from the train station by just going up a flight of steps.The station concourse and southern entrance / exit point are essentially all joined up together into one continuous space,
Once you head up the flight of steps from Victoria Station concourse you enter a large space (see below):
This space is all publicly accessible. Just to the right of this shot there is a McDonald's restaurant. You're only checked by security when you pass through the yellow doors to the arena.
This space is publicly accessible and it's a kind of "pre-entrance" to the arena itself.
Just imagine how busy and packed this space gets before / after events at the arena when 21,000 people are streaming through the arena doors and you have people waiting for friends and getting a bite to eat.
I could very well be wrong but the space in the picture above is where I'm guessing the explosion took place.
I walk through this area almost every day and through my own psychosis and paranoia etc I've always thought this would be a great area for a terrorist attack to inflict maximum casualties with minimum risk of being stopped, purely for how packed out the space above gets, how it's easily and publicly accessible and how there are no security checks before accessing the arena itself.
The arena itself is one of the largest and busiest arenas of its type anywhere in the world.
RIP to the victims.
