Watch: Supporters at Buckingham Palace gates react to news of King Charles cancer diagnosis

On Monday Buckingham Palace announced that King Charles III has been diagnosed with cancer and will be stepping away from public duties during his treatment.

The diagnosis came after the King's recent hospital visit for benign prostate enlargement, during which the palace said "a separate issue of concern was noted".

Tourists and residents at the gates of Buckingham Palace offered the King their support.

Londoner Chris said: "It's shocking, unbelievable. Cancer is really, really shocking because although he came in at 73 I thought he would do 10 years with health, and energy and strength. I've very disappointed."

He added: "I thought it was a joke really. I thought it was a practical joke. He just came back from hospital - why are you saying he's got cancer now. Please, get out of here."

Cristina, visiting the city, said: "Well, I actually found out yesterday and my reaction was 'really surprised', especially as we recently knew the condition of Kate. I was surprised and felt pity for him. I was sad about it."

Pepijn, another visitor, told LondonWorld: "I think cancer's pretty normal nowadays. Of course it's bad, but a family member of mine also had cancer and they survived, lucky. It makes him more human - if you know what I mean."

In a statement, 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.

"His Majesty has today commenced a schedule of regular treatments, during which time he has been advised by doctors to postpone public-facing duties.

"Throughout this period, His Majesty will continue to undertake state business and official paperwork as usual.

"The King is grateful to his medical team for their swift intervention, which was made possible thanks to his recent hospital procedure. He remains wholly positive about his treatment and looks forward to returning to full public duty as soon as possible.

"His Majesty has chosen to share his diagnosis to prevent speculation and in the hope it may assist public understanding for all those around the world who are affected by cancer."