The case dated back to 2015 when the 11 convicts killed three policemen and burnt their vehicle.
The Mufti's opinion is non-binding as it is usually considered a formality, but his final opinion could reduce the penalty.
Thousands of extremists have been detained and faced trials. Morsi and some prominent figures of his group have received final verdicts that varied from death to life sentence over charges of murder, violence and spying.
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