HORRIFIC: A #Pittsburgh woman knocked out cold on a busy sidewalk. Instead of getting help, groups of men come by and take videos of her, rob her, even take selfies. Meanwhile NOBODY CALLED 911. KDKA-TV EXCLUSIVE: https://t.co/kQSQqrO7Vu pic.twitter.com/ueqlOTWWg0

Shocking surveillance video shows the moment a Pittsburgh woman was knocked out cold by a man on a busy sidewalk — but that’s not the worst of it.

The footage also shows the woman being beaten and robbed by bystanders — who proceed to take pictures of her, including selfies — as she lies unconscious on the ground.

“They don’t treat animals like that. They wouldn’t treat a dog that way,” the victim’s mother told KDKA on Thursday. “It’s disgusting. My daughter needs help.”

The disturbing incident was caught on camera in Pittsburgh’s Beechview neighborhood. The footage was captured more than a month ago, but wasn’t released until this week.

“She’s lying there like somebody just hit a deer,” said Dr. Neil Capretto, a local physician at the Gateway Rehab center who has agreed to treat the victim for an apparent drug addiction.

“It’s like a sideshow in a circus,” he added. “This is a human being.”

In the clip, the woman appears to approach her attacker for a brief second right before he throws his haymaker. A group of men can then be seen walking over to her — cellphones in hand, snapping pictures and video — as she lies unconscious on the sidewalk.

“Nobody called 911 to help her,” a police source told KDKA. “They took what looks like her phone while she’s out cold.”

Shortly after leaving, the men reportedly returned and began taking even more photos.

“They actually come back,” the source said. “A kid lays beside her and takes a selfie.”

According to KDKA, the victim is a known drug addict who has been arrested several times, mostly for illegal substances.

“They deserve to be helped,” Capretto said of residents with drug problems.

“This is my oath, to help people who are sick,” he added. “I, as a physician, this is my oath, to help people who are sick. She’s sick and she needs help.”