Many of them have died in mysterious circumstances.
Green Left Party (GLP) lawmaker Omer Faruk Gargaroglu said that in the first six months of this year twenty-six political prisoners have died in Turkish prisons, 11 of whom were previously known to have serious illnesses.
Government officials have said that a number of the prisoners have committed suicide, but that is a not possible, since it is difficult for prisoners to commit suicide, the lawmaker added.
He stressed that some of the prisoners died in mysterious circumstances, while there are surveillance cameras inside the prisons.