It is not known why 'Abed al-Hafith 'Abed al-Rahman is being detained or whether any charges have been brought against him.
Amnesty International has called on the Tunisian President to end the daily harassment of former political prisoners ahead of the country's national independence day.
Amnesty International has welcomed the release of an Iranian football journalist who was detained for publishing posters supporting an Iranian-Azerbaijani football team.
Ahmed Mostafa was facing jail after he after he published a post alleging nepotism within the armed forces.
Amnesty International has called for the Egyptian authorities to release a blogger and prisoner of conscience who published a post alleging nepotism within the armed forces.
Hengameh Shahidi began a six-year sentence last week, for charges relating to her political work in the wake of last year's disputed presidential election.