Taylor Swift 'completely in shock' after attack on UK dance class, third child dead

Police say a third child is dead after a 17-year-old boy went on a stabbing spree at a Taylor Swift-themed dance class for young children in the United Kingdom on Monday. 

The girl, aged 9, died of her injuries early Tuesday, the BBC reported. Five other children and two adults remain in critical condition at local hospitals.

Swift said she was "completely in shock" and still processing "the horror" of the attack.

"These were just little kids at a dance class," she wrote in an Instagram story.