Thames Valley Police were called to the Job Centre, Southgate House in Midsummer Boulevard, Milton Keynes at 11.25am yesterday (10/10).
There were reports of an altercation between two men.
One of the men was taken to Milton Keynes University Hospital for treatment and has since been discharged.
Another man suffered grazes and bruises and did not need any further treatment.
A 47-year-old man was arrested on suspicion of assault and has subsequently been de-arrested.
An investigation has started to establish the circumstances of what happened and is ongoing at this time.
Thames Valley Police are appealing for any witnesses to get in touch on 101 or online using the reference ‘43180310050’.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.