Talk about awkward! *shakes head* You could cut several of those words and make the sentence a lot tighter and clearer. Also, why would anyone put a comma there?
Neighbors and locals could be seen to be visibly upset and comforting each other at the scene.
That corrects the punctuation. Just for the hell of it, let’s see if we can do something about the words.
Neighbors and locals, visibly upset, comforted each other at the scene.
I put the comma back and gave it a friend. It’s there for a reason now. You could remove visibly upset, but then you’d need to remove the commas, too.