Staff working for the British royal family have been summoned to a meeting in London, according to a royal source.
The meeting will take place at 10 a.m. (5 a.m. ET). CNN understands that something significant will be discussed but that there is no cause for alarm.
It is normal for royal staff to be first informed of any significant news, followed by a public announcement.
The meeting was called by the Lord Chamberlain, the most senior member of Queen Elizabeth II’s household staff.
These types of meetings are highly unusual, but they do take place a couple of times each year.
The Queen, who is 91, met with British Prime Minister Theresa May at the palace Wednesday after Parliament was dissolved in preparation for the June 8 general election.
The same day, 95-year-old Prince Philip was photographed during an event at the Lord’s Cricket Ground in London.