King Charles III said messages of support brought him to tears as he was seen resuming official duties for the first time since his cancer diagnosis, reports BBCSkyNews, quoted by News.ro.

The 75-year-old monarch, who has been staying at Sandringham since his first treatment session, had his weekly private audience with Prime Minister Rishi Sunak at Buckingham Palace on Wednesday. It was the first face-to-face meeting with the Prime Minister since Buckingham Palace announced the monarch was suffering from “a form of cancer”.

King Charles was pictured greeting Rishi Sunak and was seen at work for the first time since his cancer diagnosis. Pictures show him shaking hands with Rishi Sunak as he arrived for an audience at Buckingham Palace on Wednesday afternoon.

“I am glad to see you looking so well,” Sunak said to the king.

In response, the king joked that it was all a trick, but went on to say that he had “received so many beautiful messages and congratulations” that “they made him cry”.

The camera captured the moment Rishi Sunak arrived at the palace’s audience hall, and as they sat down, the king spoke of his passion for cancer charities. But the rest of their meeting, as always, was private.

In the afternoon, the king attended a monthly meeting of the Privy Council, the body of advisers to the monarch, made up mainly of senior politicians from the House of Commons and the House of Lords.

The King stayed at Sandringham, Norfolk, after his first cancer treatment session in London two weeks ago. Last Sunday, the king was seen smiling and greeting onlookers before attending a church service.

Earlier this month, Buckingham Palace announced that the king had been diagnosed with cancer during prostate enlargement surgery. The palace did not release details about the type of cancer or the type of treatment.

In a statement following the announcement, the king sent his “heartfelt thanks” for the messages of support and well wishes he had received.

The Queen opened up about her husband’s diagnosis for the first time at an event at Salisbury Cathedral earlier this month. She told Ben Abbott, a paramedic in intensive care: “He is doing extremely well under the circumstances. He is very touched by all the letters and messages from the public from all over. This is very encouraging.”

The announcement that the king was suffering from cancer was accompanied by a rare return to Britain of the youngest son, Prince Harry, who had flown from the US to visit his father.

Meanwhile, eldest son Prince William, who has been helping the king with his royal duties, spoke for the first time since his father was diagnosed with cancer earlier this month: “We really appreciate all the kind messages, thank you,” he said as he arrived to a gala for the London Ambulance Service in central London on February 8.

The king started cancer treatment on an outpatient basis.

Buckingham Palace said the king has suspended all official duties following a cancer diagnosis, but intends to continue working on state papers. The palace also said the king would have a weekly telephone audience with the prime minister for two weeks. On Tuesday, they saw each other face to face for the first time.