Three arrests, three more suspects sought by police. At least they will be tried as adults. Unbelievable. http://www.philly.com/philly/blogs/delco/171568261.html?cmpid=15585797 A pack of teen girls "unmercifully" beat a mentally-challenged woman in Chester and then posted a video of their unthinkable act on Facebook, police said. "It's one of the more horrible things I've watched in 40 years of police work," said Chester Police Commissioner Joseph Bail Jr. "It was a senseless, unprovoked attack.