Two children were killed and nine more were injured in what police described as a “ferocious” stabbing attack in northwest England Monday morning during a Taylor Swift-themed dance event. A 17-year-old male was later arrested in connection with the violence.

The knife attack unfolded in Southport, a seaside town in Merseyside, which is north of Liverpool, Merseyside Police said.

Authorities were called to a property on Hart Street at 11:50 a.m. (6:50 a.m. ET) on reports of a stabbing. 

In…