Police interviewed witnesses and looked for suspects Sunday after two men were shot and wounded following a 49ers-Raiders preseason game. Meanwhile, the NFL and the mayors of San Francisco and Oakland jointly called for an end to "intimidation" and acts of violence at sporting events. Saturday night's shooting in the parking lot at Candlestick Park evoked memories of another recent disturbing act of postgame violence involving two rival California pro sports teams -- the near-fatal beating this spring of a San Francisco Giants fan outside Dodger Stadium.