The prisoners are calling for a Presidential pardon and said that they will not suspend their fast unto death till they get an acceptable solution.
The prisoners at the Welikada prison are among those who are taking part in the fast, the Prisons Department officials were quoted as saying by Colombo Gazette.
The Tamil National Alliance (TNA) has called for the release of all Tamil political prisoners.
TNA leader R Sampanthan, who is the leader of the Opposition in Parliament, last week appealed to the Government not to look at the issue on political prisoners as a legal issue.