Police are hunting a dozen men who hospitalised staff at a bar in Kings Cross.
The large group, wearing t-shirts and shorts attached staff at the Be at One Bar in Caledonian Road in the early hours of Sunday July 26.
Staff were taken to a central London Hospital and treated for their injuries following the assault.
Police are appealing for any information about the fight including any victims as a result of this attack.
A 24-year-old man was arrested and bailed to a date in mid October.
DC Joe Marston, Islington CID, said: “This was a serious and unprovoked assault on several members of staff and also members of public, where the offenders threw glass at the victims. One individual has sustained serious injuries - which they are yet to fully recover from.
“I am keen to speak to any victim or witness to this incident”.
Anyone with information should call Islington CID on 0207 421 0323 quoting ref 2717347/14 or call Crimestoppers anonymously on 0800 555 111.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here