Ariana Grande, Tom Holland, Demi Lovato, More Share Love for Victims of London Bridge Attack

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"My heart goes out to everyone in London tonight. Absolutely Heartbreaking."

Actors, musicians and artists are sending their prayers and messages of love to London following reports of a vehicle running down pedestrians on London Bridge and individuals being stabbed at nearby Borough Market.

Prime Minister Theresa May said it was a potential act of terrorism, and the Metropolitan Police Force said it had declared the attacks as "terrorist incidents." May said that "following updates from police and security officials, I can confirm that the terrible incident in London is being treated as a potential act of terrorism." She said it was a fast-moving investigation, and her thoughts were with "those who are caught up in these dreadful events." May's office said she would chair a meeting of the government's COBRA emergency committee on Sunday.

President Donald Trump shared a message on Twitter, saying, "Whatever the United States can do to help out in London and the U.K., we will be there," while multiple celebrities also shared their concern and condolences.

"My heart goes out to everyone in London tonight. Absolutely Heartbreaking," Spider-Man: Homecoming star Tom Holland wrote on Twitter.

"Praying for London," tweeted singers Demi Lovato and Joe Jonas.

See the reactions as they continue to pour in on social media below, and follow the developing story here.

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