Nobody has reported any other car being involved.
I realize that. It just seems to be implied to me by reports of a crash. That's why I agreed with what Lancey Howard was saying. So either I'm just wrong in thinking a crash implies contact with something outside of their car (which does not necessarily mean another car) or it's poor reporting or maybe just not yet knowing what the facts are yet.
and nobody has said specifically that is was a single car accident.
Obviously there must a witness somewhere...hopefully they will be tracked down.