CHESTER, Pa. – Six teenagers were in custody Friday on charges they brutally beat a neighbor on her stoop "just for fun" and then posted cellphone video of the attack on Facebook, authorities said.

Four 16- and 17-year-old girls were charged as adults in the attack on the 48-year-old woman, a crime that has shaken this struggling city of about 30,000 residents just outside Philadelphia. The girls were charged with aggravated assault, reckless endangerment, burglary and harassment. Another teen girl and a 19-year-old woman were also arrested later Friday afternoon.

The woman, whom police described as "mentally challenged," was punched, kicked and hit with a shoe and chair, and suffered cuts and bruises but no broken bones, authorities said. Her name was not released.