The world is in mourning after it was revealed Friday that Prince Philip had passed away at age 99.

The Archbishop of Canterbury Justin Welby and U.K. Prime Minister Boris Johnson were among those sending their condolences to the Royal Family at this sad time.

Johnson said in a speech outside 10 Downing Street: “We give thanks, as a nation and a kingdom, to the extraordinary life and work of Prince Philip, Duke of Edinburgh.”

Downing Street and Buckingham Palace lowered their flags to half-mast to pay tribute to the beloved royal.

RELATED: The Queen Sends Sweet Note And Flowers To The Healthcare Workers Who Cared For Prince Philip

The Royal Family Twitter account also changed its photo to Queen Elizabeth’s Coat of Arms to mark the sad occasion.

See more reaction below.

Bill Clinton said of Prince Philip’s death in a statement: “Hillary and I mourn the passing of His Royal Highness The Duke of Edinburgh, and we join people from all around the world in giving thanks for his remarkable life of service. We enjoyed every opportunity we had to visit with him through the years, and will always be deeply grateful for the kindness he showed us.

“We send our thoughts and prayers to Her Majesty The Queen, her family, and all the people of the United Kingdom and the Commonwealth.”

The messages come after the Royal Family released a statement Friday which read: “It is with deep sorrow that Her Majesty The Queen announces the death of her beloved husband, His Royal Highness The Prince Philip, Duke of Edinburgh.

“His Royal Highness passed away peacefully this morning at Windsor Castle.

“Further announcements will be made in due course.

“The Royal Family join with people around the world in mourning his loss.”

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Prince Philip And The Queen Through The Years