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The blast struck near the historic Khan el-Khalili market in eastern Cairo. Eleven other people were wounded, six seriously.
Reports are still very confused, with the number of injured varying from media outlet to media outlet. What is confirmed, however, is that the Cairo blast was the result of some hand-thrown object, probably a hand grenade.
According to Reuters, another hand-thrown device was being disarmed. This tends to point to the second device being a dud, as a hand grenade does not give anyone enough time to disarm it.
Mohammed Abdul Azim, 56, who was inside the Al-Hussein mosque when the attack took place, said:
"I was praying and there was a big boom and people started panicking and rushing out of the mosque, then police came and sealed the main door, evacuating us out of the back. We thought that Egypt was the only country safe from bombings."