CAIRO-A protest group advocating conscience prisoners plan a protest on Saturday in Cairo against keeping an activist in solitary confinement. The Committee of Defending Opinion Prisoners, a non-governmental group, has said it will hold a protest outside the office of the Prosecutor-General in central Cairo against jailing Ahmed Duma, a political activist, in an allegedly filthy prison. Last month, a Cairo court setenced Suma, a member of the protest group 6th of April, to three months in prisons on charges of attacking two policemen during a demonstration in Cairo on May 3.