As Egyptians continue to count the dead on Thursday, one day after the military-installed government used deadly force to disperse protests, supporters of the deposed president, Mohamed Morsi, drew attention to video of civilians being cut down by gunfire during the assault on a sit-in near the Rabaa al-Adawiya mosque in Cairo.

One of the distressing clips, uploaded to YouTube on Thursday, showed a protester being shot as he tried to carry a wounded man to safety. A second, more graphic clip showed the shooting of a woman who appeared to have been recording video of the assault on the protesters. It is not clear from the footage if she was a participant in the protest or one of a number of journalists who were among the day’s casualties.

For rights workers and journalists, the process of piecing together a reliable account of exactly how hundreds of Egyptians were killed on Wednesday brought them to a makeshift morgue at the Iman mosque, to view bodies brought there after the nearby Rabaa mosque was burned down. Our colleague Kareem Fahim, Heba Morayef of Human Rights Watch, and the journalists Tara Todras-Whitehill and Sharif Kouddous all reported from there that the process of identifying the dead was complicated by how badly burned many of the bodies were.

Families stand over their dead in Iman mosque now. Counted 235 bodies, cd b few more, all came from Rab3a //t.co/jeGN2eOOZY — hebamorayef (@hebamorayef) 15 Aug 13

At least 10 bodies were burnt, apparently after room in field hospital where bodies kept was set on fire //t.co/ez3yjzNgtd — hebamorayef (@hebamorayef) 15 Aug 13

More than 200 bodies here, many badly burned. //t.co/UHwOFb5MeX — Kareem Fahim (@kfahim) 15 Aug 13

Saw over a hundred bodies in Eman mosque who died in #Rabaa. Many were burned beyond recognition #Egypt //t.co/TwtmB4sRM7 — T Todras-Whitehill (@taratw) 15 Aug 13

Many bodies are charred. Burned in the field hospital or mosque, people say. (Warning graphic photo) //t.co/y4W6erTNfw — Sharif Kouddous (@sharifkouddous) 15 Aug 13

As Reuters reported, the official death toll of 525 released by Egypt’s Health Ministry on Thursday does not include more than 200 bodies at the mosque that have yet to be identified. One activist blogger who was present during the raid, Mohamed el-Zahaby, claimed that this might have been the reason that so many of the dead were incinerated. “They burned the dead bodies to not be recognized or get counted,” Mr. Zahaby wrote to The Lede in an Internet message.

Extremely graphic video published Wednesday by the newspaper El Watan of the charred bodies of protesters killed during the raid on another sit-in, in Cairo’s Nahda Square, offered grim testimony to how difficult the process of identification would be.

Egyptian state television broadcast aerial footage of the Rabaa al-Adawiya protest camp in flames on Wednesday night, along with on-screen captions that blamed protesters from the Muslim Brotherhood for starting the fires.

While it is not clear how all of the fires started or spread, it is possible that some of the destruction could have been inadvertent. In video recorded on Wednesday by the Egyptian photographer Mosa’ab Elshamy during the assault on the Rabaa camp, Morsi supporters could be seen feeding fires, apparently to offer cover for rock throwing and protection from tear gas.

A Human Rights Watch video report on the dispersal of the Rabaa protest, recorded on Wednesday as the battle for the protest site was still under way, showed some fire damage but illustrated that the area was still largely intact hours after the beginning of the assault.

A video report from Ahram Online, the state newspaper’s English-language site, gave a sense of the scale of destruction by the fires that swept through the protest camp and the Rabaa mosque.

Late Thursday, the Washington Post correspondent Abigail Hauslohner reported that the authorities had raided the Iman mosque, and were seen removing the remains.