13-year-old who reportedly slammed elderly woman to the ground is arrested. Video of the brutal incident is hard to watch.

Authorities arrested a 13-year-old girl as a suspect in a violent robbery after she reportedly slammed an elderly woman to the ground hard enough to break the woman's hip.

What are the details?

Police said that the unnamed 13-year-old girl was caught on surveillance footage violently robbing the unnamed 76-year-old woman as she and two other suspects fought to gain access to the woman's Bronx apartment building on Monday night.

According to a report from WNBC-TV, the teen now faces charges of robbery and assault in connection with the incident.

According to previous reporting, police said the victim was entering a lobby at Roberts and Hobart Avenues in Pelham Bay when three suspects converged on her — one yanking her hair.

Surveillance video showed the moment the unnamed elderly woman attempted to shut the door of the building in a bid to keep out the apparent intruders. The suspects, however, were able to force their way in.

One of the teens — who police identified as the "main aggressor" — could be seen snatching the elderly woman's purse while spinning the woman around and throwing her to the ground. A second suspect was be seen smirking and laughing as the 13-year-old grappled with the victim.

According to the station, the three suspects were able to flee from the scene with the woman's purse, which contained approximately $50 in cash in addition to the woman's debit card.

Authorities are continuing to investigate the incident, and it is unclear at the time of this reporting whether the other two suspects will face any charges in connection to the attack.

What else?

The woman's son, Sean, told the station that his mother — who loved to dance with her friends — may never fully recover from the brutal attack.

"For something like this to happen is completely senseless and random violence. It’s shocking and heartbreaking," he said. "She loves to go out and hang out with her girlfriends, she goes dancing maybe once a month at a bar that has live music. She was out that night. She had her dancing shoes on."

Sean added that his mother was always mobile and eager to help out neighbors and friends with their everyday tasks.

"She was somebody that was walking around everywhere and helping everyone else out," he said. "I don’t think she saw the rest of her life using a walker, which is a real possibility ... Who does that? Who thinks that’s OK? And who thinks this, for like three young people to gang up on an old person?"