I think the explosion might have come from the building too? The debris field (in other photos I've seen) is all going away from the building. Some of the bricks laying that far away could be blamed on a post explosion collapse but the trees and the signs are all blown/bent away from the building.

Plus if you watch the video and look at the frame where the explosion starts, it looks like it could actually be coming from inside a building to the right of the camera.

At least that's what I'm seeing.

I think the explosion might have come from the building too? The debris field is all going away from the building. Some of the bricks laying that far away could be blamed on a post explosion collapse but the trees and the signs are all blown/bent away from the building.

Plus if you watch the video and look at the frame where the explosion starts, it looks like it could actually be coming from inside a building to the right of the camera.

At least that's what I'm seeing.