It's the premiere of The Twilight Saga: Breaking Dawn - Part Two, in London tonight. Stars including Robert Pattinson and Taylor Lautner will on on the red carpet in Leicester Square.
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Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.
At least five people have suffered minor injuries but the cause of the blast is still unknown.
A songwriter from Harlesden who wrote a track for Beyonce's Lemonade album has been nominated for a Grammy Award.