Stunning video from Southport England where 10 young girls were stabbed .

A group of children were attending a Taylor Swift-themed yoga and dance workshop at a studio in Southport on Monday when the attack took place.

A 9-year-old girl died in the hospital in the early hours of Tuesday, the police said in a statement, while two other girls, age 6 and 7, died on Monday as a result of their injuries.

Police refuse to release details on the 17 year-old killer.