This story has been updated
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 Thursday.
"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."
Early Thursday morning, a concerned citizen went to Chester police to report a disturbing video she had seen on Facebook.
According to Bail, the video begins with the group of six girls who appear to be about 15 or 16 rapping and dancing. At one point, one of the teens says, "I'm gonna' f--- this b---- up," and they all jump a 48-year-old woman sitting on the front stoop of her apartment.