Egypt's Attorney General Talaat Ibrahim ordered the arrest of all members of a group that goes by the name "Black Bloc" on Tuesday.
He has asked the police and army to arrest anyone who is suspected to belong to the group and hand them over to the authorities.
The prosecution's technical office has run investigations that revealed that "Black Bloc is an organized group that practices terrorist activities," reported the Middle East News Agency.
The prosecution's statement added that according to Egypt's criminal code, members of the group will face punishment for vandalism, attacking citizens and properties and threatening national security.
The group first appeared at demonstrations that were held over the weekend to mark the second anniversary of the January 25 revolt that toppled Hosni Mubarak.
"Chaos against injustice" is the group's motto as shown on their official Facebook page which has garnered almost 30 thousand fans over the weekend.