A disturbing video showing a cop beating a homeless woman with his baton is under investigation.

In the phone footage, a DeKalb County Police Department officer identified as P.J. Larscheid strikses Katie McCrary over and over in a convenience store in Decatur, Georgia.

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The incident took place on June 4.

At one point, a defenseless McCrary tries to grab the baton and the cop shouts: ‘Let it go, or I’m gonna shoot you.’

The altercation is reported to have taken place after McCrary told the officer she was a federal agent and gave him a random badge number as she walked past him, according to AJC.com.

screenshot from youtube video showing cop beat homeless woman
The cop was filmed striking the woman over and over (Picture: YouTube)
screenshot from youtube video showing cop beat homeless woman
He hit her with his baton around ten times (Picture: YouTube)
screenshot from youtube video showing cop beat homeless woman
The homeless woman struggled to break free during the altercation (Picture: YouTube)

Larscheid warned her not to impersonate an officer when she allegedly tried to grab his badge.

Things escalated as he attempted to arrest her.

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Part of the police report by Larscheid reads: ‘I continued my baton strikes to her legs and forearms instructing her to stop resisting and to lay down with her hands behind her back.

‘One strike inadvertently struck the side of her head as she was moving around.’

screenshot from youtube video showing cop beat homeless woman
Bystanders are heard telling the woman not to resist arrest (Picture: YouTube)
screenshot from youtube video showing cop beat homeless woman
At one point the cop says he doesn’t want to shoot her (Picture: YouTube)
screenshot from youtube video showing cop beat homeless woman
Internal Affairs are investigating the video (Picture: YouTube)
screenshot from youtube video showing cop beat homeless woman
It is not known what action — if any — the police department will take (Picture: YouTube)

McCrary was taken to Grady Memorial Hospital and later released with no serious injuries.

DeKalb police spokeswoman Officer Shiera Campbell said the officer had been placed on administrative duties while an investigation into use of force took place.

She said in a statement: ‘The incident was investigated by his supervisor, as well as Internal Affairs. The narrative in the officer’s report appeared to be consistent with the video.’

McCrary was charged with obstructing law enforcement and was handed a criminal trespass warning.