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First Look Islamic State group claims Manchester bombing at Ariana Grande concert

The incident is the worst terrorist attack on British soil since the bombings on London's transport system in 2005.

Peter Byrne/AP

The Islamic State group claimed responsibility Tuesday for the suicide attack at an Ariana Grande show that left 22 people dead as young concertgoers fled, some still wearing the American pop star's trademark kitten ears and holding pink balloons.