By early yesterday afternoon, there were so many corpses arriving at Cairo's Zeinhom mortuary that the street outside was blocked with a queue of orange ambulances. Inside one of them, mechanical engineer Mohamed Khamis waited with the body of his 15-year-old son, Omar, shot in the head by police.
"He will go back to school this autumn, God willing," said Mohamed, struggling to come to terms with Omar's death, his hands still covered in his son's dried blood.
Six hours earlier, both father and son had been surveying the scene of Cairo's most recent massacre. They had taken care to avoid the frontline, but suddenly they heard gunfire close by. Mohamed turned to run. "And as I turned, I felt him fall on my shoulder. I put my hand out to catch him and his head fell on my hand. I felt his crushed skull. There was blood on the floor. He was already dead."
Omar Khamis was one of dozens of pro-Morsi supporters killed by state officials in an eight-hour-long massacre - Egypt's second mass killing of Islamists in three weeks. Egypt's Health Ministry said at least 72 people have been killed in Cairo.
In post-revolutionary Cairo, more divided than ever after the toppling of Morsi on July 3, the narrative of history is rarely straightforward. Yesterday the city was awash with claims and counterclaims about whether the bloody events had been provoked.