London: King Charles was hospitalised in London after experiencing side effects from ongoing cancer treatment, Buckingham Palace has announced.

In a statement issued on Friday morning, it was confirmed the 76-year-old monarch had cancelled public events because of a short period of observation at the London Clinic, the same hospital where he had treatment for an enlarged prostate in January last year.

The King had planned to travel to Birmingham for a busy schedule of engagements on Friday, which included a tour of the city’s Royal Ballet.

“His Majesty has now returned to Clarence House and as a precautionary measure, acting on medical advice, tomorrow’s diary program will also be rescheduled,” the statement said.

“His Majesty would like to send his apologies to all those who may be inconvenienced or disappointed as a result.”

A palace spokesperson said meetings with three ambassadors on Thursday were also affected, and he was “greatly disappointed” to be missing his appointments in Birmingham.

The Queen, who was at a public event to mark the 70th anniversary of commercial broadcaster ITV, did not join the King on his hospital visit.

Charles has undergone regular treatment since February last year, but has not revealed what type of cancer he has, other than confirming it is not prostate cancer. Further details of his condition have not been disclosed.