WATCH: Pennsylvania officer tasers an unarmed man

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A police officer is under investigation after shooting an unarmed African American man with a stun gun in the city of Pennsylvania.

Lancaster Bureau of Police said officers responded to a 911 call that said the victim, Sean D. Williams, 27, was chasing a group of three people with a baseball bat, New York Times reported.

In a video shared on social media, the police officer Philip Bernot asked Williams to sit on the curb and stick out his legs straight in front of him.

Then, Officer Shannon Mazzante, who arrived at the scene first, ordered Williams to cross his legs again.

Confused, the man was adjusting his position to comply with the cops’ orders, but as soon as he tries to cross his legs, Bernot shoots him in his back.

The young man writhed around in pain.

He was arrested and placed in police custody, but then subsequently released on a $5,000 bond.

The officers also reported they did not find any baseball bats at the scene.

Lancaster Mayor Danene Sorace said in a statement she was “upset” by the images and an investigation was underway into the use of force during the incident.

The video went viral and social media users are protesting against the officer’s act.