so they had time in just a few hours to go in and rig explosives up. Please. Go have a look at the time line and what was happening around it. That is even less founded than half the CTs.
wibble, both explanations seem unlikely, pre-planted charges, conspiracy theories aside, would not have detonated as planned baring in mind the damage, and the timeline for a proper precise demolition is tight, but I can't find anything better to fit the observations of events that day and the inconsistency in the news reports.