Several people were injured during Saturday's attack, including political activists known for frequenting the cafes, witnesses told al-Shorouk newspaper. They said the attackers fired birdshot and launched fireworks.
Hazemoun is comprised of former presidential candidate Hazem Salah Abu Ismail's supporters, and Ahrar is a self-styled vigilante youth group that promotes public virtue, Egypt Independent reported.
Nativity scenes to be moved at Guantanamo after troops' protest
Christian anarchists take credit for stealing racy calendars from Mall