The London Assembly's Health and Environment Committee will hear opinions from a range of experts about proposed cuts to accident and emergency units later. Seven hospitals are under threat across the capital.
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Defence Minister Tobias Ellwood sais the UK is going through a "dark chapter" .
MPs held a minute's silence in the House of Commons and memorial services are planned to pay tribute to the victims of the attack.
A teenager has been arrested after a mass bomb hoax closed hundreds of schools across the UK.