Inmates of Yangon's Insein Prison protested on Friday against Myanmar's military junta, which has sent many of them to the jail since its Feb. 1 coup.

The chants of the inmates, many of them political prisoners, were heard on Friday morning outside the high walls of the prison and in a video posted on social media.

"The fall of dictatorship -- our duty, our duty", "to regain democracy -- our duty, our duty" and "the revolution -- will succeed, will succeed" echoed both inside and outside the prison.

Witnesses saw trucks loaded with soldiers arrive at the jail, Khit Thit Media reported.