CONCORD, Calif. - Federal authorities are asking for the public's help to identify a woman accused of assaulting officers and stealing an FBI agent's badge at an immigration protest in Concord on Tuesday. A special agent with the FBI said the woman they're looking for was an "instigator" of violence at the demonstration. (snip) In a news release, the FBI said the woman was wearing a hoodie at the time of the incident. Costin described her as the "lead aggressor." "She seemed to be an instigator of much of the violence. She seemed to be a lead aggressor." The agency...