>No audience members will be present, per the Biden campaign's demands.
Probably because they can't even pay people to support him.
>It is unclear what caused the collision
It is a barge and likely unpowered.
Looks like a tanker barge carrying liquid fuel or similar.
Somehow it became unfastened and was allowed to drift on the current into the bridge.
If it broke free multiple lines would need to break or become unfastened.
Likelihood of multiple fastenings failing simultaneously would be slim to none.