That backpack have been talking about is missing between pictures 1 & 2. No doubt here. First picture ... lower right at 7th vertical rail on gate moving right is a backpack on sidewalk. Second photo ... lower right at 7th vertical rail on gate moving right backpack is missing. How much time elapsed between pictures 1 & 2, please?
The perspective of the two photos is slightly different as you can see the white line in the road on the second photo but not in the first photo.
Explanation?
It looks like the fence has moved forward toward what is the bomb in the picture. It seems to me that if the bomb was on the street side of the fence that the fence would have been blasted away from the street and toward the crowd and buildings.
If seems to jive with the woman who was killed. The woman looks exactly like the one killed. If that is her friend next too her, she was probably saved because she was in back of the mailbox.
I have trouble believing that was the bomb location. Look at the mailbox next to it. No dents or apparent damage.
http://media.image.infoseek.co.jp/isnews/photos/afpbb/afpbb_2939203_0.jpg
Interesting pic. Lots of interest close to that mail box.