Thailand has been under martial law since the coup toppled the elected government last year, despite growing calls from rights groups and the international community for the junta to rescind the draconian law.
Political gatherings and criticism of the coup are forbidden under the law, with the junta responding aggressively to any form of protest.
The Thai junta has repeatedly justified martial law by saying Thailand's bitter political divisions need more time to heal, while they set about remodelling the kingdom's political structure.
Thailand has endured nearly a decade of political turmoil since billionaire former premier Thaksin Shinawatra rattled the establishment by winning elections with his populist politics.