Slain Dallas officers remembered at vigil

More than 1,000 people have gathered in downtown Dallas to attend a candlelight vigil for the five police officers killed during a protest march.Speakers at the Monday night vigil included police officials and friends of the slain officers. Portraits of the officers were propped up in front of the speaker's platform.Dallas Police Chief David Brown told the crowd that police officers are like superheroes.Dallas Area Rapid Transit Chief J.D. Spiller said he would challenge anyone who thought what