The August 2015 bombing left 20 dead in the centre of the city in an unprecedented attack on the junta-ruled nation.
The two accused, Yusufu Mieraili and Bilal Mohammed, were scooped up by Thai police in the days after the bombing and have been held in military custody ever since. Both deny the charges.
Thursday's delay added a fresh layer of farce to a case that has been marked by official obfuscation, with police unable to offer a convincing motive for the attack, according to analysts.//AFP