The Attorney General of Tanta Prosecutions Ibrahim Abou el Sood decided to hold in custody 13 members of the terrorist Muslim Brotherhood (MB) 15 days pending investigation.
They are accused of inciting riot and violence as well as disrupting public peace and intimidating citizens.
The attorney decided to free four others.
Gharbiya security forces managed to arrest the suspects upon a decision from the general prosecution. They were transferred to Tanta General Prison.