Anti-Wall Street protesters filled a street with a late-night march Wednesday and Oakland’s police chief pledged a vigorous investigation into an earlier clash between police and protesters that left an Iraq War veteran in critical condition with a fractured skull. Police Chief Howard Jordan spoke as tensions grew over demonstration encampment in the Bay area. “It’s unfortunate it happened. I wish that it didn’t happen. Our goal, obviously, isn’t to cause injury to anyone,” the chief said at an afternoon press conference.