NFL security leaders and top law enforcement officials say there is ''no credible threat'' to Super Bowl 50. Jeffrey Miller, NFL senior vice president of security, planned to walk the perimeter of Levi's Stadium again Wednesday and he estimates it's approximately three to four miles around the facility in Santa Clara where Sunday's Super Bowl will be played between Carolina and Denver. Miller said he is satisfied with the collaborative effort between local, state and federal law enforcement agencies to handle any possible issues, including terrorism of any kind. More...