The country has released scores of prisoners of conscience as part of dramatic reforms, implemented since the end of outright military rule in 2011, that have ended the former pariah's international isolation and seen most western sanctions disbanded.
Myanmar late yesterday said it would pardon those imprisoned under a series of controversial legislation, including the Emergency Act used by the junta to imprison opponents as well as laws governing freedom of assembly and the right to protest.
"I would like to say that the president has fulfilled his promise given to the people, because there will be no political prisoners at all at the end of 2013," he said in a post on his Facebook page, without giving further details.
It was not immediately clear how many people would be affected by the release, which began today and also affects people facing charges under the laws.
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Campaigners recently said some 40 dissidents were behind bars under Myanmar's draconian laws, while a further 200 people were awaiting trial, mainly for protesting without permission.
Peace activists Yan Naing Tun and Aung Min Oo, who were sentenced in recent weeks to eight months in prison for marching to the rebel town of Laiza in strife-torn northern Kachin state, were greeted by jubilant supporters as they walked free from the jail.
"I respect the president for keeping his promise," Yan Naing Tun told reporters.
Former general Thein Sein, who has won international plaudits for overseeing new political and civil freedoms since becoming president nearly three years ago, had vowed to free all detained activists by the end of the year.
Before Myanmar's reforms, rights groups accused the country of wrongfully imprisoning about 2,000 political detainees -- most of whom have since been freed.