The mother of a 17-year-old teenager is demanding answers from Alabama police who allegedly beat her son to an unrecognizable pulp when he ran from officers during a random stop.

Angela Williams shared horrific photos of her son, Ulysses Wilkerson, whose face was left swollen and bloodied after an encounter with Troy police Saturday night.

'Troy police officers did this to my son While he was in handcuffs,' Williams wrote in a now-viral Facebook post.

Angela Williams, the mother of 17-year-old, Ulysses Wilkerson (left and right), is demanding answers from Alabama police who allegedly beat her son to an unrecognizable pulp when he ran from officers during a random stop

Williams shared horrific photos of her son, Ulysses, whose face was left swollen and bloodied after an encounter with Troy police on Saturday night

Williams said that her son has a fracture and was transported to UAB Hospital in Birmingham for surgery, but he was released because of the extensive swelling.

The incident unfolded Saturday night when officers saw Ulysses walking behind a closed business in downtown Troy, according to BuzzFeed.

Officers then exited their vehicle and approached Ulysses, who fled on foot. Authorities chased the teen down and a struggle ensued.

The Alabama State Bureau of Investigation is now investigating the incident.

In a statement, the Bureau told BuzzFeed that Troy officers arrested a 17-year-old at 11.52pm on Saturday.

During the arrest, the teen was injured and transported to Troy Regional Medical Center, the statement said.

A witness also reportedly saw the officers standing around a seemingly unconscious Ulysses, according to the news site.

Williams' post had been shared more than 75,000 times as of Wednesday evening.

Williams (pictured with Ulysses) said her son has a fracture and was transported to UAB Hospital in Birmingham for surgery, but he was released because of the extensive swelling

The incident unfolded when officers saw Ulysses (pictured) walking behind a closed business in the city's downtown area. Officers then exited their vehicle and approached Ulysses, who fled on foot. Authorities chased the teen down and a struggle ensued

Wilkerson's father also shared the photos of his son on Facebook. 'As y'all can see troy police officers tried to kill my son and he has massive swelling and they can't start surgery until swelling goes down,' he said on Sunday. An investigation into the brutal beating is ongoing

'From all over the world, people are commenting they want justice,' the teen's father, Ulysses Wilkerson Jr, told WKRG.

'They had him handcuffed when we got in there they said he was charged with obstruction of justice the ambulance came to take him to UAB they took the handcuffs off and dropped the charges on him,' said his father.

Wilkerson's father also shared the photos of his son on Facebook.

'As y'all can see troy police officers tried to kill my son and he has massive swelling and they can't start surgery until swelling goes down,' he said on Sunday.

Lt Heath Carpenter told BuzzFeed News that the investigation is still 'open and active'.

But Carpenter couldn't confirm whether the police department had put any officers involved on leave.

The Wilkerson family is asking for body and dash camera footage to be released.