The 13 were charged with launching arson attacks against government offices in Mukdahan.
They were released temporarily after their lawyer posted assets worth Bt2 million as guarantee for each of them.
They were identified as Duang Khonyuen, Thaweesak Khengraeng, Natthawut Pikulsri, Maitree Phankhoon, Noppachai Pikulsri, Panom Kunnok, Wichai Uluphan, Prakong Thongnoi, Winai Pinsilapachai, Samak Lunrila, Kaen Nongphudsa, Tinnawat Muangkhote and Wichit Inta.