There were scenes of hysteria among defendants' relatives outside court when the verdicts were passed. Photo: BBC

The defendants faced charges over an attack on a police station in Minya in 2013 in which a policeman was killed.

However, the judge also commuted to life terms 492 death sentences out of 529 passed in March in a separate case.

Also on Monday, a court banned a youth group that helped ignite the uprising that toppled Hosni Mubarak in 2011.

The decision passed in Cairo to outlaw the April 6 pro-democracy movement was based on a complaint that accused the group of "tarnishing the image" of Egypt and colluding with foreign parties.

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Analysis

Orla GuerinBBC News, Minya

The verdict hit waiting relatives like a body blow. Several women collapsed on the ground, and had to be carried away. A man stood weeping in front of a line of riot police, protesting that his brother was an innocent man.

One women told us she had five family members among the almost 700 men who received a preliminary death sentence. From time to time she slapped her own face, in a gesture of anguish.

Confusion added to the torment for those whose loved ones were among 529 men in a separate mass trial. Thirty-seven life sentences were upheld, and the rest commuted to life imprisonment. In the chaos outside the court relatives could not find out which men had been condemned to hang.

Ahmed Maher, the group's leader, was sentenced to three years in prison in December for violating a law that bans all but police-sanctioned protests.

'Where is the justice?'

The cases and speed of the mass trial hearings have drawn widespread criticism from human rights groups and the UN.

The trials took just hours each and the court prevented defence lawyers from presenting their case, according to Human Right Watch.

The sentences have been referred to the Grand Mufti - Egypt's top Islamic authority - for approval or rejection, a step which correspondents say is usually considered a formality. A final decision will be issued in June.

The BBC's Orla Guerin says relatives collapsed in grief after hearing the verdict. A large crowd chanted: "Where is the justice?"

Mohammed Badie, centre, was arrested last August after a month on the run

Authorities have cracked down harshly on Islamists since President Mohammed Morsi, who belongs to the Muslim Brotherhood, was removed by the military in July.

Hundreds have been killed and thousands arrested.

The verdict was the first against Mr Badie in the several trials he faces on various charges along with Mr Morsi himself and other Brotherhood leaders.

'Farcical'

Of the 683 sentenced on Monday, only about 50 are in detention but the others have a right to a retrial if they hand themselves in.

The group were accused of involvement in the murder and attempted murder of policemen in Minya province on 14 August, the day police killed hundreds of Muslim Brotherhood supporters in clashes in Cairo.

Defence lawyers boycotted the last session, branding it "farcical."

Families outside the court were not told who of the 529 sentenced in March faced the death penalty

The final judgement on the sentencing of the 529 Muslim Brotherhood supporters accused of attacking another police station in the same province on the same day means 37 will now face the death penalty.

Defence lawyer Khaled Elkomy said 60% of those defendants, including teachers and doctors, have evidence that "proves they were not present" when that station was attacked, a statement released by human rights group Avaaz said.

Last month, the UN human rights commissioner condemned the two trials and said they had breached international human rights law.

A spokesman for Navi Pillay said the "cursory mass trial" was "rife with procedural irregularities."

Protests against the military-backed government have continued despite the crackdown

The government had defended the court's handling of the first mass case, insisting that the sentences were passed only "after careful study" and were subject to appeal.

At least 1,000 opponents of the military-installed regime have been sentenced since December. As well as the death sentences, the jail terms passed range from six months to life.

The authorities have designated the Brotherhood a terrorist group, blaming it for a series of bombings and attacks. The group has strongly denied the accusations.