Reuters says the charge was trumped up to muzzle their reporting into a massacre of Rohingya men.
The Committee to Protect Journalists said 34 of the 53 journalists killed on duty this year around the world were 'singled out for murder'.
Some held copies of the latest cover of Time magazine featuring the journalists and their families.
The reporters will remain in prison during the appeal process.
The protesters released black balloons printed with the words "Free Wa Lone and Kyaw Soe Oo".
The journalists, who pleaded not guilty, were investigating the killing of 10 Rohingya Muslim villagers by the Myanmar security forces at the time of their arrest in December.
The journalists were investigating the killing of Rohingyas by security forces and civilians.
Yangon northern district judge Ye Lwin said Wa Lone, 32, and Kyaw Soe Oo, 28, breached the colonial-era Official Secrets Act when they collected and obtained confidential documents.
The reporters and one police witness for the prosecution have testified they were set up by police to block or punish them for their reporting of a mass killing of Rohingya Muslims.
The Yangon court has been holding hearings since January to decide whether two Reuters reporters are guilty of breaching the colonial-era Official Secrets Act.
Their former teacher Ye Naing Moe, director of Yangon Journalism School, praised both reporters as curious and excellent students who had won multiple awards for stories focusing on the underprivileged and social issues.
Kyaw Soe Oo, 28, and his Reuters colleague, Wa Lone, 32, are facing up to 14 years in prison in Myanmar for allegedly violating the country's colonial-era Official Secrets Act.
Kyaw Soe Oo and his Reuters colleague Wa Lone, 32, are facing up to 14 years in prison for allegedly violating Myanmar's colonial-era Official Secrets Act.
The court in Yangon has been holding pre-trial hearings since January to decide whether Wa Lone, 32, and Kyaw Soe Oo, 28, should face charges under the colonial-era Official Secrets Act.
The court in Yangon has been holding hearings since January to decide whether Kyaw Soe Oo, 28, and Wa Lone, 32, should be charged under the colonial-era Official Secrets Act.
After hearing the arguments, the court in Yangon will rule on whether Wa Lone, 32, and Kyaw Soe Oo, 28, will be charged under the colonial-era Official Secrets Act, which carries a maximum penalty of 14 years in prison.
A reporter vents her anger at those who once struggled for media coverage, but who now treat journalists from the independent media the same way the previous government did.
Twelve RTVS reporters quit on Thursday in protest against increased political pressure.
Captain Moe Yan Naing was jailed for violating the Police Disciplinary Act.
Wa Lone and Kyaw Soe Oo are at risk of imprisonment for 14 years under the Official Secrets Act.
This comes after Malaysia approved a law prescribing up to six years' imprisonment for such offences.
Lawyers for Liberty says journalism is not a crime and that the Dewan Rakyat speaker's remarks yesterday were uncalled for.
Minister says Dewan Rakyat Speaker Pandikar Amin Mulia only has the best interests of the House in mind, following new rule banning media from Parliament lobby.
Many reporters loved to cover Chief Minister Adenan Satem’s functions as he never avoided their questions.
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