Crowds have dispersed from City Hall and Newtownards road areas. But police still remain in Albertbridge road area. There are reports that St Matthew's Catholic Church in east Belfast is being attacked by loyalists.
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Hundreds of pupils from Alperton Community School in Brent, London,cheered and waved flags as Andria Zafirakou arrived holding the prize.
The Novichok incident in Salisbury has turned into an international diplomatic crisis. But how bad could things get? Adam Shaw reports.
Among those murdered was Keith Palmer, an unarmed constable who "did his job and never wanted any fuss."