According to the New York Times:
The survivors, who were shot in the head, chest or arms, or who had been hit in the face by birdshot pellets, all told roughly the same story. They were attacked without warning with tear gas and gunfire near the end of morning prayers. Some said that soldiers and police officers attacked from opposite sides. Others said that because of the dark, they were not sure which security branch their attackers belonged to.
The violence marks a turning point in the Egyptian political crisis and the country is decidedly split. As Moataz Abu al-Shakra, a 25-year-old electrical engineer put it, “It is like they were fighting a war between two countries, not like our army or police.”
As of now, negotiations are in progress for forming an interim government, but no decision has been reached as to who will take office next.
The country has been without a fully functioning government since Wednesday.
Our thoughts and prayers are with the families of the deceased.