The forensic report issued on Sunday reveals that the four Copts killed in sectarian violence in Qalioubiya governorate, just north of Cairo, were all shot with live ammunition, most likely from a machine gun.

The Copts killed in Saturday’s sectarian clashes in the Qalioubiya town of Al-Khosous are Morqos Kamel (25 years old), Victor Saad (35), Mansour Attia (45) and Essam Tawadros (25). One Muslim was also killed in the violence.

The clashes erupted on Saturday after a group of Christian teenagers allegedly painted offensive drawings on the gates of an Al-Azhar (Muslim) institution in Qalioubiya.

The situation further escalated when someone fired a gunshot into the air, killing one boy with a stray bullet, Reuters reported.

In the aftermath of the violence, 15 people were arrested and at least seven injured.

Shops belonging to Christians were reportedly smashed by angry protesters. Reuters stated that some Christian and Muslim properties were burned.

The violence echoed in Cairo on Sunday when mourners exiting Saint Mark's Cathedral were pelted with stones by unknown assailants and soon gunshots were heard.

That attack left one dead and tens injured.