Egyptian security forces have launched a nationwide manhunt for Muslim Brotherhood leaders, security sources told Anadolu Agency on Friday.
Agents of Egypt's National Security and Public Security Services are targeting leaders of the Brotherhood's administrative offices on charges of inciting violence, they added.
The sources gave no further details.
Administrative officers are considered the link between top Muslim Brotherhood leaders and the group's grassroots cadres. They are also responsible for organizing the group's activities.
On Thursday, security forces arrested Muslim Brotherhood leaders in several provinces ahead of planned mass Friday rallies by Morsi supporters.
Four Muslim Brotherhood leaders were arrested in the Nile Delta province of Beheira late Thursday.
Two other Brotherhood members, including the secretary-general of the group's Freedom and Justice Party (FJP), were detained in the Upper Egyptian Assiut province.
Security forces also detained former FJP lawmaker Emad Shams al-Din in the Nile Delta province of Daqahliya and FJP Secretary-General for the Gharbiya province Ali Ahmed.
Security forces also raided and searched the homes of three Brotherhood leaders in the Nile Delta Kafr al-Sheikh province.
The homes of former Kafr al-Sheikh governor Saad al-Husseini and a nephew of prominent Salafist preacher Safwat Hegazi were also searched.
Security forces also raided the home and office of former lawmaker and FJP Secretary-General for Daqahliya Mohsen Radi.
Pro-Morsi demonstrators are staging a fresh wave of rallies today in several Egyptian cities to protest Wednesday's violent dispersal of their two main protests sites in Cairo and Giza.
"Our revolution is peaceful; we will continue to mobilize without violence or sabotage," the National Alliance for the Defense of Legitimacy, a pro-Morsi coalition of largely Islamist parties and figures, said in a Friday statement.
Egypt has been in a state of turmoil since security forces on Wednesday violently dispersed two major protest camps set up by Morsi supporters in Cairo's Rabaa al-Adawiya Square and Giza's Nahda Square.
The Health Ministry has said that at least 638 people had been killed in nationwide violence since Wednesday, including 288 in Rabaa and 87 in Nahda.
However, the official death toll remains far below that given by the pro-Morsi alliance, which has put the number of deaths from the Rabaa sit-in alone at some 2,600.