Birmingham City v Aston Villa: Fan 'pushed over by police'
A video appearing to show police officers pushing a football fan to the ground is being investigated.
The footage was recorded as fans walked home from a Championship clash between Aston Villa and Birmingham City on Sunday.
Reiss Mahon said his father Rodney was set upon by officers "without provocation".
West Midlands Police said it would take action if officers had acted inappropriately.
Birmingham City fan Mr Mahon, said he was walking "calmly" with his father and brother Callum on a footpath near City's St Andrew's ground when it happened.
"I have never seen anything like it in my life," said the 22-year-old, from Rugby.
"It [The police behaviour] was completely unacceptable."
As well as hurting his elbow, Mr Mahon said his father, in his 40s, hit his head on the floor in the fall and suffered a gash on his leg.
He said his father, who has had to take time off from his job as a warehouse worker, went to see a doctor and was told he may have chipped his elbow.
The video, taken by Scott Findlay, has been shared dozens of times on social media.
Ch Insp Brian Carmichael, from West Midlands Police's standards department, said: "The circumstances surrounding the incident and actions of the officers involved will be investigated…we expect the highest standards from all our staff and anyone found to have acted inappropriately will face disciplinary action."
Officers arrested 14 people during the afternoon, on suspicion of a range of offences including violent disorder, pitch encroachment and affray.
The match marked the first time the second city rivals had met in a league game for five years and followed Villa's relegation to The Championship.
It finished 1-1 after goals from Gary Gardner and David Davis.