More than 7O people are reported to have been killed in Cairo at a protest being held by supporters of ousted Egyptian President Mohammed Morsi.
A doctor at a field hospital close to the protest at the Rabaa al-Adawiya mosque told the BBC that more than 1,000 people had also been injured.
The health ministry put the death toll at 20, with 177 wounded.
But others sources say, at least 75 are dead while about a thousand have suffered varying degrees of injuries.
Both pro- and anti-Morsi supporters had been holding huge protests overnight in the capital.
Many thousands occupied Cairo’s Tahrir Square in support of the army, which removed Mr Morsi from office earlier this month.
Army chief Gen Abdel Fattah al-Sisi had urged people to take to the streets to give the military a mandate for its intervention.