The Guardian has a detailed breakdown. with maps, photos, and videos of the sequence of events as they unfolded yesterday. They also provide a sequence of the inflammatory rhetoric of Trump and his acolytes leading up to yesterday.
One thing jumped out at me about the crowd: “Members of the crowd, including some wearing body armour and helmets, begin peeling away from the park, walking the kilometre or so down Pennsylvania Avenue towards the Capitol.”
This is consistent with other reports that I read that said that some of the people who first breached the capitol building were organized and following a pre-determined plan. This was not entirely a spontaneous riot.