Police have tonight bailed the father of a 6 year old girl who was arrested in connection with her death at her family home in South London.
Ellie Butler collapsed in Sutton on Monday - a post mortem examination has revealed she died from a head injury.
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Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
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.