A lone protester taunts Seattle Police department officers during May Day demonstrations in Seattle, Washington May 1, 2013. Protesters clashed with police in Seattle on Wednesday as a May Day rally that began peacefully turned violent after dark, with demonstrators hurling objects at officers who responded by firing flash-bang grenades and pepper spray. REUTERS/Matt Mills McKnight (UNITED STATES - Tags: POLITICS CIVIL UNREST BUSINESS EMPLOYMENT)