The website run by Anonymous for the Million Masks March claims that there will be more than 400 protests around the world.
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The character's death will send shockwaves through Weatherfield.
It reportedly threatened attacks on planes "flying from Heathrow to the US" across the July 4 US Independence Day holiday weekend.
Accompanied by the Duke of Edinburgh, the Queen will attend the opening ceremony of the fifth session in the Holyrood chamber.