The statement offered Egypt's deepest condolences to victims' families and wished a speedy recovery for the injured.

The blast occurred on Friday during noon prayers, killing at least 18 people and injured 23 others, according to news reports.

The source of the explosion remains unidentified, with no one claiming responsibility for the blast as of yet.

Egypt reiterates its denunciation and rejection of all forms of violence, extremism and terrorism, the foreign ministry's statement said.

The explosion is the latest in a series of terrorist attacks across the Sunni-majority country against civilians and mosques, both Shia and Sunni, some of which have been claimed by the Islamic State group (IS).

IS has been stepping up its attacks across Afghanistan to become the primary enemy of the Taliban since their takeover of the country last year.