Four teenage girls have been arrested for viciously beating a mentally challenged 48-year-old woman in front of her home in Chester, PA, then uploading the video to Facebook. According to the Delaware County Daily Times, the girls—one age 17 and the other three age 16—were offered candy or gum by the woman, then launched an attack that began on the woman's front porch and ended in her living room (the photo above shows the aftermath). 

Local authorities believe that the attack was purely for fun, and a neighbor says this isn't the first time the woman has been attacked. The woman was reportedly hit over the head with a gun just two weeks ago.

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[via BuzzFeed]