An Egyptian military court on Tuesday sentenced 11 members of the Muslim Brotherhood to life in prison after accusing them of "aggression" against the army in the city of Suez last month.
One person was jailed for life, three people to 15 years and 45 others to five years, a military statement said.
The men were accused of "shooting and adopting violent means" against the army in Suez on August 14 following a military crackdown in the streets of Cairo against supporters of the ousted President Mohamed Morsi.
Earlier, military sources said 11 Morsi supporters had got life sentences.
Morsi belonged to the Brotherhood movement.
The Brotherhood was founded in 1928 and formally dissolved by Egypt\’s army rulers in 1954.
The Brotherhood operated for decades as a formally outlawed organisation until veteran autocrat Hosni Mubarak was deposed in 2011.
The movement then won a series of elections culminating in last year\’s presidential vote.
The military deposed Morsi on July 3 after mass protests against his rule.
Since then, most of the Brotherhood\’s top leadership has been arrested and face charges of inciting violence. Morsi was himself referred to trial on Sunday on that charge.
Also on Tuesday, a court in Cairo ordered the closure of four television stations, including the Brotherhood\’s Ahrar 25 TV and al-Jazeera\’s Egyptian affiliate Mubasher Misr, saying they were operating illegally.
The stations were seen by the authorities as being sympathetic to the Brotherhood.
Meanwhile, Egyptian helicopters fired rockets at armed groups based in the northern Sinai peninsula, killing at least eight people.
At least a further 15 people were injured in the attack.
The security source said the two aircraft on Tuesday surprised gatherings of fighters in three houses in two locations, al-Muqataa and Touma, south of the town of Sheikh Zuweyid near the border with the Gaza Strip.
Attacks on security personnel have surged in Sinai after the toppling of Morsi on July 3.