A Cairo court for urgent matters designated on Monday a group calling itself the “Popular Resistance” a terrorist organisation.
In May 2016, the group claimed responsibility for the killing of eight policemen in the Cairo suburb of Helwan.
The same attack was later claimed by the Islamic State militant group.
The Popular Resistance, which was formed in 2014, first gained widespread attention in June 2015 when it claimed responsibility for the murder of the country's chief prosecutor Hisham Barakat in Cairo.
Since 2013, the Egyptian government has linked most of the militant groups in the country to the banned Muslim Brotherhood organisation.
Egypt's government declared the Muslim Brotherhood a terrorist organisation in late 2013 following a number of deadly attacks on security forces the government blamed on the group in the aftermath of the ouster of Islamist president Mohamed Morsi.