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An Egyptian military court Tuesday sentenced Muslim Brotherhood leader Mohammed Badie to ten years in prison over deadly clashes following the 2013 ouster of Islamist president Mohamed Morsi, judicial officials said.

Ninety other defendants who were tried in absentia were sentenced to life terms, which in Egypt means 25 years.

Badie and dozens of others were found guilty of participating in clashes that killed 31 people in the canal city of Suez between the 14 and 16 August 2013.

The clashes erupted after police brutally broke up two pro-Morsi protest camps in Cairo on August 14 that year.

The charges in the military trial included vandalism, inciting violence, murder, assaulting military personnel and setting fire to armoured personnel carriers and two Coptic churches in Suez.

Badie, the Brotherhood's spiritual guide, was sentenced to 10 years along with fellow Brotherhood leader Mohamed Beltagy and Safwat Hegazy, a pro-Brotherhood Islamist, army and judicial officials said.

Forty-one defendants were sentenced to serve between three and seven years, 90 others were handed down life sentences and 59 others were acquitted.

Tuesday's sentences can be appealed.

Badie is facing several trials and has been sentenced to death in a separate case along with Morsi for plotting jailbreaks and attacks on police during the 2011 uprising that ousted president Hosni Mubarak.

The Brotherhood chief has also been handed life sentences in five other cases.

Hundreds of Morsi supporters were killed on 14 August, 2013 when police stormed their camps in Cairo, just weeks after the Islamist president was ousted by then army chief and now President Abdel Fattah al-Sisi.

Military tribunals in Egypt have faced criticism for their harsh and swift verdicts.

Egypt's constitution allows military trials of civilians accused of violence against military targets - which include public infrastructure such as highways and bridges as well as universities.

Since Morsi's overthrow, the authorities have launched a brutal crackdown against his supporters, leaving hundreds dead and thousands jailed after often speedy mass trials.

Morsi himself is facing several trials and has already been sentenced to death in one case. The Brotherhood has been outlawed as a "terrorist organisation".