The men were convicted of playing a role in the killings of policemen in the town of Kardasa in August 2013, during the upheaval that followed the army's toppling of Egypt's former President Mohamed Morsi.
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The attack took place on the same day security forces violently dismantled two massive protest camps supporting Morsi in Cairo, killing hundreds of protesters in clashes.
The December verdict was the third mass death sentence of 2014, and was roundly condemned by rights groups.
"Mass death sentences are fast losing Egypt's judiciary whatever reputation for independence it once had," Sarah Leah Whitson, Middle East and North Africa director for Human Rights Watch, said at the time.
"Instead of weighing the evidence against each person, judges are convicting defendants en masse without regard for fair trial standards," she said.
In April 2014, Egyptians were shocked when a court passed down 683 death sentences in one trial.