Egypt's Muslim Brotherhood has called on President Mursi's supporters to take to the streets of Cairo on Tuesday.
Protests against Mursi's decision to assume sweeping powers in the country were already planned in the capital for the same day.
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It may never be known what happened when four band members of Viola Beach were killed when their plunged into a canal, an inquest has heard.
The UK's highest court has been told that a motion in Parliament does not have any bearing on the legal issue it is having to decide.