After an EDL rally in Whitehall was dispersed earlier, supporters of the far-right group are now running through Leicester Square chanting "English till I die" and throwing bottles at police.
Police are holding the protesters in Leicester Square and closing the pubs in which they had been drinking.
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The brisk northerly wind will make it feel rather cold.
The actor was asked about black or mixed race role models and whether Markle's upcoming marriage to Harry would help inspire young people.
Youngsters are still consuming too much unnecessary sugar and caffeine, according to the study.