An explosive device detonated along a main road in Cairo today as security forces passed by, killing at least one civilian bystander and injuring another, the interior ministry said on Facebook.
There was no immediate claim of responsibility.
Egypt faces an insurgency led by Daesh’s branch in the northern Sinai, where hundreds of soldiers and police have been killed. There have also been attacks in Cairo and other cities.
Last week, Brigadier-General Adel Rajaaie, an armoured division commander who had served in northern Sinai, was shot dead in front of his home on the outskirts of Cairo.
A newly-emerged militant group calling itself Liwa Al-Thawra, or the Revolution Brigade, claimed responsibility for the attack on a Twitter account that was suspended shortly after the claim.
Judges and other senior officials have increasingly been targeted by those angered by hefty prison sentences imposed on members of the now-outlawed Muslim Brotherhood.
The Brotherhood, which has no proven ties to violent extremism, and its candidate Mohamed Morsi won Egypt’s first free elections after the 2011 uprising that ended Hosni Mubarak’s 30-year rule.
Since Morsi was deposed in 2013 after mass protests against his rule, former army chief Abdel Fattah Al-Sisi has overseen a brutal crackdown in which thousands of Brotherhood and democratic supporters have been killed, with yet thousands more jailed or sentenced to death.
Another new militant group called Al-Hasm Movement has claimed responsibility for five attacks since July, including an assassination attempt on Zakaria Abdel Aziz, a senior Egyptian prosecutor.
The group said the attack was in revenge for death sentences handed down to thousands of people that have been accused of terrorism. Human rights groups have slammed these sentences as politically motivated.