(CNN) -- An alleged sexual assault of a Texas girl involving nearly 20 people was recorded on cell phones, and a video of the alleged incident was circulating among students in her school district As of Monday, 13 adults and five juveniles had been arrested as part of the investigation, authorities said. A defense attorney for one of the suspects told CNN affiliate KPRC that the number of suspects could increase. "I don't know the exact number of people involved," James Evans said. "I've heard as many as 28 or more." The case has sharply divided the community, according to...