Abdurrahman Khaled Mahmud Abdurrahman (codenamed Mo'tassem) receives an order from operative Mohamed Ayesh who lives in Turkey to drive a car loaded with explosives to an area west of Cairo until he receives other orders for carrying out a bomb attack.
Mo'tassem then lives in a flat in Shorouk neighborhood and in another in Etssa, one of the centers of Fayoum province in central Egypt.
He then meets the other members of the same cell, namely Hossam Abdel Mohamed, Ibrahim Khaled and Islam Mohamed Qurani.
Mo'tassem drives the same car to meet his father and mother to bid them farewell for the last time at al-Azhar Park in eastern Cairo. He then sets on a journey through the streets of Cairo to carry out the bomb attack.
On August 4, Mo'tassem drives his car through the streets of al-Manial district. However, because of his ignorance of the district he drove into a security post. He then decides to take a U-turn and leave the whole place and river on the street just in front of the Cancer Institute. He then collides with another car because he was driving opposite the main direction of the street.
The collision causes the car to go off. Twenty people died and 40 others were injured because of the blast, according to Egyptian health authorities. Rescue workers also collected human parts at the bombing site. These were the remains of the perpetrator of the attack.
Following a DNA test and an analysis of the victims of the blast, specialists succeeded in putting the face of the perpetrator of the attack together and finally determined him to be Mo'tassem, a member of the Muslim Brotherhood Hasm militia.
Security version
Policemen succeeded in determining the route the car had used by revising footage on the cameras of the streets. The perpetrator of the bombing has a terrorist record, while his brother is a member of the Brotherhood.
The authorities also succeeded in determining the whereabouts of the cell to which Mo'tassem belonged. Some of the members of the cell lived in Shorouk neighborhood and the other members lived in Sonorous city.
Policemen raided the two places and killed seven members of the cell. They also arrested Hossam Adel Ahmed (codenamed Muazz). He testified that he was involved in planning the bombing outside the Cancer Institute.
He said he joined Hasm militia in 2018 and that Mo'tassem was the leader of the cell.
Ahmed said he was responsible for logistical support in the cell and that he and other members of the cell received directives from leaders living in both Turkey and Sudan.
On August 8, the security authorities aired footage of the car used in the bombing and footage of Mo'tassem meeting his family at al-Azhar Park. They also aired a phone conversation between Mo'tassem and Mohamed Ayesh who lives in Turkey.
Can Hasm do it?
Hasm issued a statement on the day following the bombing, in which it denied the official story about its involvement in the attack. It said it never targets civilians.
An Egyptian security official, however, said all indicators refer to Hasm, including the militia's repeated attempts to carry out attacks in the past few days.
He referred to an attempt by the group to stage an attack outside the Grand Egyptian Museum which is being constructed near the Pyramids Plateau in Giza.
"This huge number of terrorist attacks can only be bankrolled by the Muslim Brotherhood," the official, who requested anonymity, said.
He viewed Hasm's denial of involvement in the attack as a normal thing.
"This is a disgraceful operation for any terrorist organization because of the civilian toll from it," the official said.
Islamist affairs specialist Ahmed al-Shorbagi said the Brotherhood never declares responsibility for the terrorist attacks it launches.
"They even deny responsibility for carrying out historical attacks they are very famous for," he told The Reference.