[Steve Van Doorn]

said, "The RV was absolutely the source of the explosion"
Watch this video.
At the beginning of this video you can visually see the RV on the left side of the street. Correct?

At six seconds what side of the street was the vortex of the explosion?
https://www.youtube.com/watch?v=K0IxbQD9mac&feature=emb_logo

[Valpal1]

Ejected flaming debris, possibly a container of explosive materials.