AN investigation is under way after a 16-year-old boy was hospitalised after being struck in the head by a police officer's baton amid clashes between Barnsley and Sheffield Wednesday supporters yesterday.

A cop was also taken to hospital with injuries to his stomach and head after responding to disorder between the rival fans outside the Barnsley Interchange following the match.

3 An investigation is underway after a teen football fan was hit in the head with a police baton yesterday

3 The boy was left bleeding from the head after being hit with the baton

A video, which is being widely shared online, showed the cop hitting the teen Sheffield Wednesday fan over the head with his baton.

The person who shared the video, Spencer White, said two fans had been fighting, but claimed the reaction of the officer was excessive.

The teen fan was seen lying on the floor with blood pouring from his head.

The boy's mum shouted: "That's my son, you f***ing idiot".

Furious fans then surrounded the police officers, with one screaming: "I swear to god, that was a f***ing liberty".

Another shouted: "Disgusting...that was out of order."

The incident happened outside the Barnsley Interchange following yesterday's South Yorkshire derby that finished 1-1.

3 Blood was left on the pavement after the boy was hit with the police baton

South Yorkshire Police said an investigation was underway.

Chief Superintendent and match commander Sarah Poolman said: "Yesterday, following the Barnsley v Sheffield Wednesday match, our officers responded to disorder between fans outside of the Transport Interchange.

"A full, open investigation, including extended video footage, will take place to ascertain the circumstances surrounding the incident, including the actions that led to a 16 year-old boy sustaining a head injury from an officer’s baton and an officer being assaulted, sustaining injuries to his stomach and head.

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"The 16 year-old boy was taken to hospital by ambulance. The police officer also attended hospital.

"A 47 year-old man was arrested on suspicion of assaulting an emergency service worker. He has been released under investigation."

Anyone who witnessed the incident or has video footage, should contact 101 quoting incident 232.