Buckingham Palace is investigating following reports a member of staff was arrested after a Christmas party.
The incident is said to have occurred at a branch of All Bar One in central London following a drinks reception at the royal residence.
The Metropolitan Police said officers were called to a bar in Victoria shortly after 9pm on Tuesday after reports a customer had smashed glasses and tried to assault a member of staff.
A 24-year-old woman, who The Sun reported is believed to work as a maid at the palace, was arrested on suspicion of assault, criminal damage and being drunk and disorderly.
A witness told the newspaper: “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.”
Police said the woman was taken into custody and released the following evening after being handed a fine for disorder.
A palace spokesperson said an investigation has been launched into the incident.
“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,” they said.
“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.”
Around 50 staff members were said to have been at the bar after they had earlier enjoyed drinks at the palace.
The Met said: “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.”
People whose homes have been destroyed by the floods sweeping across parts of the UK over the past couple of days have been telling Sky News how they coped with the deluge.
In Lincolnshire, where a major incident has been declared, Terry, from Grantham, showed a Sky crew the aftermath of the deluge in his home, which was left under two feet of water.
“Everything’s gone,” he said, adding that he was “devastated”.
The first sign of trouble came at lunchtime on Monday, when his wife woke him and said there was water coming in [to the house], and “within a few minutes, the whole house was flooded”.
They rushed their belongings and pets upstairs, he said, as he revealed the damage to the flooded living room and kitchen, where the water mark was above a power socket.
Terry said the kitchen, where the floor was covered in sludge, smelled of mud and sewage, and their furniture and carpets were wrecked.
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They have no electricity and the food in the cupboards and freezer was “completely ruined”.
Graham Johnson, who lives in a boat with his wife and dog, in the village of Barrow upon Soar in Leicestershire, was in the pub on Monday night, before the water started to rise “rapidly”.
People living in a local caravan park were moved as a severe flood warning was issued.
Mr Johnson said he had gone out “for a couple of pints as usual and, the next thing we know, bingo”.
The couple feared their boat home was about to be swept towards the bridge.
“That’s our pride and joy, where we live, and we didn’t want to lose it,” he said, as he praised the “fantastic” emergency services, who rescued them and their dog after a nervy three-hour wait.
They were two of the 59 people rescued by firefighters in the county, where a major incident was declared and crews were called out to 160 flood-related incidents, the Fire Brigades Union (FBU) said.
Another Leicestershire resident whose home was inundated was Qasim Abdullah from Loughborough.
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Flooding across East Midlands
Pictures taken by the Associated Press show him walking through almost knee-deep water in his living room.
In nearby Quorn, businesses have shut as the main high street has flooded for the second time in as many years.
Two of the pubs in particular have been damaged.
Last year, residents had to launch a crowd fundraiser to help pay for the costs of renovation. Not to mention soaring insurance premiums.
Indy Burmi, who owns a hair salon and restaurant, hasn’t suffered flooding, but said he’s had to close up and cancel all Tuesday’s reservations, as his clients simply can’t get into the village.
And, with more rain forecast, conditions could get even worse in the short term, while residents worry that an annual battle with rising water is now the new normal.
Elsewhere in the UK, the next danger is from ice forming on untreated surfaces after rain on Tuesday evening, the Met Office has said, as it issued a new warning for northern England and Wales from 5pm until midday on Wednesday.
The Royal Liverpool University Hospital has declared a critical incident due to “exceptionally high” demand on A&E and patients being admitted to wards.
The hospital said there had been a spike in people with flu and respiratory illnesses going to emergency departments in recent weeks.
A spokesperson for the hospital said it had a “comprehensive plan in place” and was “taking all the necessary actions to manage the challenging circumstances”.
“We are working with partner organisations to ensure those that are medically fit can leave hospital safely and at the earliest opportunity,” they added.
The hospital warned some people would experience delays as it prioritises the sickest patients.
People whose case isn’t an emergency are being asked to see their GP, pharmacy or walk-in centre – or call the 111 service for advice.
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The Royal Liverpool University Hospital is in the city centre and is the biggest hospital in Merseyside and Cheshire.
Declaring a critical incident can happen when a hospital is experiencing exceptional demand, or sometimes if there is a serious problem with staffing levels.
It indicates it can’t function as normal and allows it to take extra measures to protect patients, such as prioritising the most unwell people and getting support from other agencies.
It could last hours, a few days, or weeks if necessary.
A critical incident was also declared on Friday by the NHS Cornwall and Isles of Scilly Integrated Care Board.
It said it had seen almost four times as many inpatients compared with last year and urged people with flu to avoid going to A&E.