King Charles, Queen Camilla, Prince William and Princess Kate have issued statements following the horrific incident in Liverpool on Monday night.
The incident occurred shortly before 6pm when a vehicle ploughed into spectators who had gathered to celebrate Liverpool's trophy parade in the city centre.
Four children were among those hurt in the attack, with one child and one adult suffering serious injuries according to police.
Merseyside Police said a 53-year-old white British man from the Liverpool area, believed to have been the driver, was detained at the scene of the attack on Water Street.
King Charles, Queen Camilla, Prince William and Princess Kate have issued statements following the horrific incident in Liverpool on Monday night.
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Authorities confirmed they are not looking for anyone else in connection with the incident, which is not being treated as terror-related.
The King said: "My wife and I were deeply shocked and saddened to hear of the terrible events that took place in Liverpool on Monday.
"It is truly devastating to see that what should have been a joyous celebration for so many could end in such distressing circumstances. At this heartbreaking time for the people of Liverpool, I know that the strength of community spirit for which your city is renowned will be a comfort and support to those in need.
"Our prayers and deepest sympathy are with all those who have been affected, and my special gratitude goes out to the first responders, emergency services personnel and other individuals who rushed to the aid of the injured."
The parade was to celebrate Liverpool FC winning the Premier League.
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The Prince and Princess of Wales also addressed the incident in a separate statement.
The couple wrote: "We are deeply saddened by the scenes in Liverpool yesterday. What should have been a joyful celebration ended with tragedy.
"Our thoughts are with those who were injured and to the first responders and emergency services on the ground. W & C".
The Princess Royal met with local officials and emergency service representatives who coordinated the response to the attack that left dozens injured, including children.
Assistant Chief Constable Jenny Sims described the horrifying scenes at the parade as an "isolated incident" during a press conference at the Cunard Building in Liverpool on Monday evening.
"Extensive inquiries are ongoing to establish the circumstances leading up to the collision," she said, adding: "It is vital that people do not speculate or spread misinformation on social media."
Emergency services responded swiftly to the attack, with fire crews having to lift the vehicle to rescue those trapped beneath it, according to Nick Searle, chief fire officer at Merseyside Fire and Rescue Service.
The Princess Royal met with local officials and emergency service representatives who coordinated the response to the attack that left dozens injured, including children.
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One child and three adults had to be freed from under the vehicle by firefighters.
David Kitchin from the North West Ambulance Service said 27 people were taken to hospital while an additional 20 were treated for minor injuries at the scene.
"This is indeed an appalling incident and we understand that people will be deeply upset," he said.
Patients went to several hospitals including the Royal Liverpool Hospital, Alder Hey Children's Hospital, Arrowe Park and Aintree Hospital.
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