Six girls beat mentally disabled woman, tape attack

View more videos at: http://nbcphiladelphia.com. By Karen Araiza and David Chang, NBCPhiladelphia.com and NBC News staff A group of teenage girls beat up a mentally disabled woman in Delaware County, Pa., videotaped the attack and posted the clip to Facebook, according to Chester police. In the video, which was obtained and published by the Delco Times, a group of six girls approached the woman, who was sitting on her stoop. One of the attackers started punching the 48-year-old woman. The attack then moved inside the home, where the teens continued punching her with their fists and hitting her with chairs, among other things. Police say the beating happened near 12th and Morton Streets Tuesday around 9 p.m. in Chester. The suspects are 16 and 17 years of age. For more visit NBCPhiladelphia.com The victim suffered cuts and bruises on her face but did not get medical help, according to police. Len Worby, one of the victim's neighbors, told the Delco Times the attack was the second in two weeks. "She got beat up about two weeks ago," Worby told the newspaper. "Someone hit her over the head with a gun." A local parent saw the video on Facebook Thursday morning and tipped off police. Police say they tracked down four of the teenage girls in the video, and they are currently in jail. Two of those arrested are sisters, according to the Delco Times. "The parents are upset," one of the officers told the Times. "The girls are defiant. It's like they didn't do anything wrong." The teenagers are scheduled for an arraignment Friday morning. Investigators say they're searching for two more girls who they believe were involved. All six will be charged as adults, according to the Delaware County District Attorney Jack Whelan. "Their behavior is animalistic to this poor woman," Whelan told the Times. "We are going to aggressively prosecute each of them for their callous indifference to this woman." More content from NBCNews.com: Cops: Man kills suspected burglar, then learns it's his teen son Five dead after workplace shooting in Minneapolis Summer's over, but drought persists; two-thirds of contiguous US affected Lucky 13 brings $202 million for Powerball ticket sold in Iowa Authorities hunting for 73-year-old accused of killing his daughter-in-law Video: Helmet camera captures soldier shot in firefight Follow US News from NBCNews.com on Twitter and Facebook