The King expressed his "shock and sorrow" as he shared a powerful message to the victims and survivors of the Manchester synagogue terror attack.
Charles said that the memory of those killed and injured in the attack on 2 October remains vivid in his mind in a message read out at Heaton Park Hebrew Synagogue in Crumpsall on Monday evening for the memorial service.
Vice Lord-Lieutenant of Greater Manchester Eamonn O’Neal read out a message to the congregation of around 800 people on behalf of the King and Queen Camilla.
It said: "My wife and I hold all those whose lives were so tragically disrupted by that terrible day most closely in our thoughts and prayers.
© WireImage"Though the months have passed, the sense of shock and sorrow remains undiminished. I shall never forget my visit to the synagogue shortly afterwards.
"It was a deeply moving and heartbreaking experience. To meet those who had been present that morning, and to hear their personal accounts of what they had experienced, was profoundly moving and troubling."
The King, 77, who is still at Balmoral for his summer break, said the memory of those who died and were injured "remains especially vivid in my mind".
What happened in the Manchester synagogue terror attack?
Melvin Cravitz, 66, and Adrian Daulby, 53, were killed when Jihad Al-Shamie, 35, drove into the gates of the synagogue on 2 October and began attacking with a knife, while wearing a fake suicide belt.
The attacker was then shot dead by police outside the synagogue on Yom Kippur, the holiest day of the year for Jews.
Yoni Finlay, who was hit by a stray police bullet during the attack, said his "life changed forever" on Yom Kippur last year.
© PA Images via Getty ImagesCommunities Secretary Angela Rayner said that Melvin and Adrian were "two men of such immense kindness killed in an act of antisemitic hate".
Meanwhile, King Charles added in his statement: "The strength, resilience, and determination in the aftermath of such trauma left an indelible impression upon me, as did my conversations with members of the Jewish community whom I met in the street as I departed.
"Today, as we remember those who so cruelly lost their lives and all who suffered injury, grief, and hardship, we also give thanks for the spirit of unity, compassion, and support, which shone so brightly in those dark days."
King Charles returns to work
It comes as the King is set to return to scheduled engagements this week after his summer holiday away from the spotlight.
Charles has been in Balmoral for the past few weeks for his annual Aberdeenshire getaway, and was joined by the Prince and Princess of Wales and their three children, alongside other senior royals including Princess Anne and the Edinburghs.
© Getty ImagesOn Sunday, the King was business as usual as he attended a church service at Crathie Kirk, a stone's throw away from his Scottish residence.
However, on Wednesday, he is set to return to Clarence House to meet the Pakistan National Cricket team, before returning to Scotland again for the Braemar Gathering at the weekend.
The busy schedule comes after Prince Harry and Meghan Markle returned to the UK last week with Prince Archie and Princess Lilibet – six years after they stepped down from royal duties and moved to the US.
