This shocking video shows a vicious lout landing more than 25 punches on a man in a Derby city centre alleyway.
The incident happened next to Silly Sids, in Babington Lane, at around 7.50pm on Saturday, October 7.
Mark Harding, who's father Mick owns the store, said he was "incredibly shocked" to see the attack when he replayed CCTV footage on one of the store's cameras.
At the end of the attack, which lasts several minutes, it appears the victim is robbed. Derbyshire police were given the exact details of when and where the incident took place but said that nothing had been reported.
Mr Harding said: "It's absolutely terrible. It was only 7.50pm so it's not like it's the early hours. It doesn't appear to be revellers or people on a night out fighting, it seems different.