LOS ANGELES (AP) — In an online sensation, police officers across the U.S. are dancing an updated version of the running man to a catchy 1990s hip hop song in videos that have included professional sports mascots, cheerleading squads and at least one explosion. The police videos posted on the Internet have been steadily getting more elaborate and more popular, with even some police chiefs joining in. Los Angeles officers filmed themselves dancing inside the Dodgers baseball stadium and at a popular hiking spot in the shadow of the Hollywood sign. Police departments are smart to take on the challenge, said Robert Thompson, a Syracuse University professor and a leading authority on American pop culture. Having the police force, uniformed police especially, smiling and dancing with people within the context of these communities, is certainly a positive message.