Two children have died and nine were injured, six of them critically, in a "ferocious" knife attack at a children's dance workshop.
Two adults are also in a critical condition after being stabbed as they tried to protect children at the Taylor Swift-themed event in Southport, Merseyside, police said.
A 17-year-old boy, from Banks in Lancashire, has been arrested on suspicion of murder and attempted murder.
Police said the motivation for the attack was "unclear" but it was not being treated as terror-related.
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