I think it could take a little while to come out, but I'm sure they had cameras in the lobby. It did just happen this morning after all. The building's structural integrity is being checked.

Exactly - the security cam footage takes a few days to be released if the company wants it, or a few weeks to leak quietly if they don't.

At 6 AM you're not going to have many people standing around with cell phone cams for it (and anyone around when the giant tank starts making horrible noises would be hopefully smart enough to run for higher ground).