Over the last few weeks, a number of drones have mysteriously been spotted over three air bases used by the US Air Force (USAF) in the UK.
The unmanned aerial devices were first spotted on 20 November, over RAF Lakenheath and RAF Mildenhall, in Suffolk, and RAF Feltwell in Norfolk.
The unusual activity has prompted an investigation by civilian police and supported by the UK’s Ministry of Defence (MoD).
Around 60 British troops, including counter-drone specialists, have also been deployed to help defend the bases.
What we know about the drone sightings
The drones were first spotted in the vicinity of the three airbases last Wednesday.
Similar movements occurred again on Friday 22 November and “during nighttime hours” on Monday this week, a spokesperson for the USAF in Europe said.
The spokesperson said the number of aerial vehicles “fluctuated” and “varied between the bases”.
When asked by Sky News’ security and defence editor Deborah Haynes, the spokesperson said there has been “no impact to residents or infrastructure and [they] have not been identified as hostile”.
“However they are still continuously being monitored to ensure the safety and security of the installations.”
Haynes added that it remains “unclear how many drones are involved, who is operating them and why they are doing it” but it seems “sufficiently serious” for the UK to deploy military personnel.
Lakenheath is home to the 48th Fighter Wing, which the USAF describes as the foundation of its combat capability in Europe.
Mildenhall hosts the 100th Air Refuelling Wing, and Feltwell is a hub for housing, schools and other services.
The three bases are leased by the USAF from Britain.
What has the UK and US said?
The MoD said it is supporting the USAF response to the sightings, adding that it “takes threats seriously”.
This response is understood to include the deployment of around 60 military personnel, including members of the RAF Regiment’s Force Protection Wing, with specialist skills in countering drones to help protect the US bases and try to find out who is responsible for operating the unmanned aerial vehicles.
The RAF troops operate the ORCUS counter-uncrewed air system, which has the ability to “detect, track, identify and, if necessary, defeat hostile drones”, according to the RAF website.
US military units said they were still monitoring the airspace over the three bases on Tuesday evening.
Who could be operating the drones?
Pentagon spokesman Major General Patrick Ryder said on Tuesday it was too soon to draw conclusions about whether the drones were sent by hobbyists.
He admitted small drones are fairly common.
However, one security source told Sky News that the drone activity was “awfully coordinated.” Another said it was “odd” and “very weird.”
A US official, speaking on condition of anonymity, agreed that it did not appear that the drones were the work of hobbyists, adding that the US military would continue to investigate.
Though it is unclear whether the drones had hostile intent, the sightings come as hostilities between Russia and Ukraine have significantly escalated.
Ukraine has struck targets inside Russia with intermediate-range missiles supplied by the US and Britain after President Joe Biden authorised the use of the weapons.
Soon after, President Vladimir warned he could hit back against countries supplying weapons being used against targets in Russia.
Lucy Letby’s father threatened a hospital boss while the trust was examining claims that the neonatal nurse was attacking babies in her care, an inquiry has heard.
Tony Chambers, the former chief executive of the Countess of Chester Hospital, described how Mr Letby became very upset during a meeting about the allegations surrounding his daughter in December 2016.
Mr Chambers led the NHS trust where neonatal nurse Letby, who fatally attacked babies between June 2015 and June 2016, worked.
It was the following year in 2017 that the NHS trust alerted the police about the suspicions Letby had been deliberately harming babies on the unit.
“Her father was very angry, he was making threats that would have just made an already difficult situation even worse,” Mr Chambers told the Thirlwall Inquiry.
“He was threatening guns to my head and all sorts of things.”
Earlier, Mr Chambers apologised to the families of the victims of Letby, but said the failure to “identify what was happening” sooner was “not a personal” one.
He was questioned on how he and colleagues responded when senior doctors raised concerns about Letby, 34, who has been sentenced to 15 whole-life terms for seven murders and seven attempted murders.
Mr Chambers started his evidence by saying: “I just want to offer my heartfelt condolences to all of the families whose babies are at the heart of this inquiry.
“I can’t imagine the impact it has had on their lives.
“I am truly sorry for the pain that may have been prolonged by any decisions that I took in good faith.”
He was then pressed on how much personal responsibility he should take for failings at the trust that permitted Letby to carry on working after suspicions had been raised with him.
“I wholeheartedly accept that the operation of the Trust’s systems failed and there were opportunities missed to take earlier steps to identify what was happening,” he said.
“It was not a personal failing,” he added.
“I have reflected long and hard as to why the board was not aware of the unexplained increase in mortality.”
Mr Chambers also said he believed the hospital should have worked more closely with the families involved, saying “on reflection the communications with the families could have and should have been better”.
The Thirlwall Inquiry is examining events at the Countess of Chester Hospital, following the multiple convictions of Letby.
Earlier this week her former boss, Alison Kelly, told the inquiry she “didn’t get everything right” but had the “best intentions” in dealing with concerns about the baby killer.
Ms Kelly was director of nursing, as well as lead for children’s safeguarding, at Countess of Chester Hospital when Letby attacked the babies.
She was in charge when Letby was moved to admin duties in July 2016 after consultants said they were worried she might be harming babies.
However, police were not called until May 2017 – following hospital bosses commissioning several reviews into the increased mortality rate.
A £50,000 reward is being offered over the unsolved theft of a batch of early Scottish coins that were stolen 17 years ago.
More than 1,000 coins from the 12th and 13th centuries were taken from the home of Lord and Lady Stewartby in Broughton, near Peebles in the Scottish Borders, in June 2007.
The stolen haul spans a period of almost 150 years, from around 1136 when the first Scottish coins were minted during the reign of David I up to around 1280 and the reign of Alexander III.
The late Lord Stewartby entrusted the remainder of his collection to The Hunterian Museum at the University of Glasgow in 2017, but the missing coins have never been found.
Crimestoppers announced its maximum reward of £20,000 – which is available for three months until 27 February – in a fresh appeal on Wednesday. An anonymous donor is helping to boost the total reward amount to £50,000.
It is hoped it will prompt people to come forward with information which could lead to the recovery of the missing treasures and the conviction of those responsible for the crime.
Angela Parker, national manager at Crimestoppers Scotland, said Lord Stewartby’s haul was the “best collection of Scottish coins ever assembled by a private individual”.
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Jesper Ericsson, curator of numismatics at The Hunterian, described the medieval coins as smaller than a modern penny.
He added: “Portraits of kings and inscriptions may be worn down to almost nothing and the coins might be oddly shaped, perhaps even cut in half or quarters.
“You could fit 1,000 into a plastic takeaway container, so they don’t take up a lot of space. They may look unremarkable, but these coins are the earliest symbols of Scotland’s monetary independence.
“They are of truly significant national importance. Their safe return will not only benefit generations of scholars, researchers, students and visitors to come, but will also right a wrong that Lord Stewartby never got to see resolved before he died.”