The big clean-up in underway in Notting Hill. This year's carnival saw around one million people enjoying a festival of music, food and dancing over the bank holiday. 196 people were arrested during the event.
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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.