West Bromwich player Nicolas Anelka has posted a picture of President Obama, rapper Jay Z, his singer wife Beyonce and an unidentified man making a gesture, only hours after he did a controversial goal celebration known in France as 'la quenelle'.
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The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.
As temperatures climb through the day, the warmest spots are likely to be across western parts of Northern Ireland and western Scotland.
The foreign secretary has criticised internet and social media giants for failing to detect and remove extremist material posted online.