Security forces arrested a suspect in the blast near Dokki's Behouth metro station after locals physically assaulted him and handed him over to police.
The suspect was taken to the Dokki police station for questioning.
On Friday, an unknown assailant reportedly threw an IED near Behouth metro station. A police recruit was killed and nine others were injured as a result of the explosion.
Meanwhile, clashes erupted in the same area between supporters of the Muslim Brotherhood and locals who were demonstrating against Friday's explosions.
Security forces dispersed the crowds from both sides and soon after reopened Tahrir street after it had been blocked for two hours as investigators gathered forensic evidence from the blast site.
Edited translation from Al-Masry Al-Youm