Prince William and Kate Middleton expressed their compassion and show of solidarity for Paris by signing a book of condolence along with their corresponding message as a tribute to the victims of the attacks.

The royal couple visited London's French embassy to pay their respects to the victims of the brutal attacks in Paris on Nov. 13, which left more than 100 people dead and others injured.

According to Mail Online, Kate and William visited the French embassy in Knightsbridge, London, to sign the book of condolence as a tribute to the tragic victims of the series of coordinate attacks in Paris.

Dressed all in black, the Duke and Duchess of Cambridge were reportedly greeted by Ambassador to France Sylvie Bermann before they each penned their condolence messages.

"To all those who have died and were injured in the heartless attacks in Paris, and to all the people in France: Nos plus sincere condolences," Prince William wrote in the book. He paused to read his message before he affixed his signature.

A copy of Prince William's message to the people of France is posted by Mail Online. "Nos plus sincere condolences" in English supposedly translates to "our deep condolences."

Kate also affixed her signature below her husband's and was photographed reading all the other condolence messages written in the book. Kensington Palace on its official Twitter page also announced the Duke and Duchess of Cambridge's visit to the French embassy in London. The palace shared a candid photo showing Prince William behind his wife as Kate sat on the table to read the book.

"The Duke and Duchess signed a book of condolence @FranceintheUK for the victims of the #ParisAttacks this afternoon," the palace captioned the photo.

Among the other political figures in London, Prime Minister David Cameron reportedly also signed the book of condolence. He had affixed his signature on his message, as seen in the photo posted by Mail Online. However, it's hard to make out the contents of his message. Mail Online said Cameron signed the book when he visited Bermann's residence.

William also visited the country as a mark of solidarity to witness the soccer match between England and France. Armed police were on high alert during the event held at the Wembley stadium, where one of the attacks on Nov. 13 also happened.

Kensington Palace on Twitter shared a couple of photos from the game, one showing Prince William holding a bouquet of flowers as a tribute to the victims. The palace captioned the shot, "Roy Hodgson, The Duke Of Cambridge and Didier Deschamps lay floral tributes on the Wembley pitch prior to kick-off."