BREAKING: UK's King Charles III diagnosed with cancer - Buckingham Palace

King Charles III has been diagnosed with a form of cancer and has begun treatment, Buckingham Palace said on Monday.

"During The King's recent hospital procedure for benign prostate enlargement, a separate issue of concern was noted. Subsequent diagnostic tests have identified a form of cancer," the palace said in a statement, adding that he had begun treatment.

The king "remains wholly positive" and "looks forward to returning to full public duty as soon as possible", it said.