King Charles III has spoken out on Monday’s mass stabbing that killed three little girls and injured eight others at a Taylor Swift-themed dance workshop in the UK.

“My wife and I have been profoundly shocked to hear of the utterly horrific incident in Southport today,” the king wrote. “We send our most heartfelt condolences, prayers and deepest sympathies to the families and loved ones of those who have so tragically lost their lives, and to all those affected by this truly appalling attack.”

The horror unfolded shortly before noon in Southport, just outside Liverpool in northwest England. Authorities say a hooded, knife-wielding teenager arrived by taxi and started attacking the children, as well as any adults who tried to stop him.

Hours later, Merseyside Police Chief Constable Serena Kennedy confirmed that two children died and nine others were injured, including six left fighting for their lives — along with two adults left in critical condition from being stabbed as they “were bravely trying to protect” the kids.

A third child died Tuesday.

Responding officers “were shocked to find that multiple people, many of whom were children, had been subjected to a ferocious attack and had serious injuries,” Kennedy said.

Authorities have not disclosed a motive — or any connection between the unidentified teen and the victims. Police say the attack is not considered to be terrorism-related.

The victims have been rushed to three local children’s hospitals, where they are being treated after the attack.

The wounded victims have been transported to Alder Hey Children’s Hospital, Aintree University Hospital and Southport and Formby Hospital. Their conditions were not immediately available.