A witness told The Sun: “The group walked in and this one girl just got hysterical.
“She started smashing glasses and abusing our staff members so we had to call the police.
“I’ve never seen one person get that crazy during a night out. She was on another level.”
Another added: “Someone kicked off outside – was smashing glasses and then got arrested.”
Police were called to the All Bar One in Victoria St in London just after 9pm.
Some 50 members of staff are said to have attended an “evening reception” at the Palace before moving on to a bar.
A Buckingham Palace spokesman said: “We are aware of an incident outside the workplace involving a number of household staff who had previously attended an early evening reception at the Palace.
“While this was an informal social gathering, not an official Palace Christmas party, the facts will be fully investigated, with a robust disciplinary process followed in relation to individual staff and appropriate action taken.”
A spokesman from the Met said: “At 9.21pm on Tuesday Dec 10 officers were called to a bar in Victoria Street, SW1, following reports that a customer had smashed glasses and attempted to assault a member of staff.
“Officers attended and arrested a 24-year-old woman on suspicion of common assault, criminal damage and being drunk and disorderly.
“She was taken into custody and released the following evening having been given a penalty notice for disorder.”
