Tactical Nuke Explodes in Baghdad? (10 October 2006)

Video said to be taken on 10 October 2006 in Baghdad, which shows what certainly looks like a small nuclear explosion (whatever "small" can mean in that context). The explosion occurs at 3:57 minutes in, but it is advisable to watch the whole thing (~5 min.) to put it into context. Looking through the comments on YouTube, it seems to be the consensus among commenting viewers that this is an authentic video, taken on the date it was said to be taken on, and at the location it was said to be taken at. The debate is whether or not the explosion is nuclear. It is, in any event, an absolutely huge, non-conventional-looking explosion. Watch and see what you think.