Four people were injured in a stabbing incident at Arndale Shopping Center in Manchester, northern England.
"Paramedics are treating four injured people at the scene," the spokeswoman for the ambulance service said.
Four Britons were injured during sporadic stabbings north of London by unidentified men in March.
Killings and injuries using knives or other white weapons in Britain, particularly London, have reached unprecedented record levels in recent years.
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