404. That’s an error.

The requested URL /bookmarks/mark?op=add&title=Event+Not+Found&annotation=&nui=1&service=bookmarks&bkmk=http%3A%2F%2Fearthquake.usgs.gov%2Fearthquakes%2Fdyfi%2Fevents%2Fnc%2F71928211%2Fus%2Findex.html was not found on this server. That’s all we know.