According to their defense lawyer, U Khin Maung Zaw, the judge said that, "Ko Wa Lone and Ko Kyaw Soe Oo were caught with state information on that day and which stated that they collected and noted down secret government information, either to share with the enemy or to use against the interests of the government by possessing or distributing them".
Speaking to reporters after the hearing, a determined Wa Lone said they would "not give up".
Earlier this month, defense lawyers said the journalists were arrested in a sting operation by the police that was aimed at interfering with their reporting.
"We are not shaken by the charges, we are innocent", he said to the crowd.
The killings were part of a military operation Myanmar launched previous year against the Rohingya, a persecuted Muslim minority in Myanmar, following a series of attacks by Rohingya rebels on government posts in the region.
They apparently were targeted by the authorities because their work concerned the brutal crackdown by security forces against minority Rohingya Muslims in Myanmar's Rakhine state. Myanmar authorities have largely denied any wrongdoing, although in April seven soldiers were sentenced to 10 years in prison for their role in the Inn Dinn killings. He did not answer calls seeking comment after the court ruling on Monday. After giving his surprise testimony, he was jailed for violating the Police Disciplinary Act and his family was forced to vacate their police housing unit.
The pair has been in pretrial detention since their arrests on december 12. "We were [arrested] for covering Rakhine state", he said.
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Defence lawyer Khin Maung Zaw said both reporters would be called to testify at the next hearing. He said four witnesses will be called for the reporters' defense, including their driver on the night of the arrest.
Media organizations and the global community see the closely watched case - packed with contradictions, conflicting accounts by police officers and absurd moments - as a litmus test for press freedom in Myanmar. While media workers had been optimistic that Suu Kyi's civilian government, elected in 2015, would enact reforms that included greater freedoms for the press, many have now expressed frustration.
Observers beyond Myanmar's borders have widely condemned the case as a thinly veiled bid to stifle press freedom in the country, which has been riven by a bloody government crackdown on the Rohingya.
"If [press freedom] was backsliding, that would mean there has been an advance".
In a statement, Reuters President and Editor-in-Chief Stephen J. Adler said "we are deeply disappointed that the court declined to end this protracted and baseless proceeding against Wa Lone and Kyaw Soe Oo". "The court's decision to proceed with this farcical, politically motivated case has deeply troubling and far-reaching implications for independent journalism in the country".
"These Reuters journalists were doing their jobs in an independent and impartial way, and there are no facts or evidence to suggest that they've done anything wrong or broken any law", he said in a statement. "They should be released and reunited with their families, friends, and colleagues", he added.
"The decision is further evidence of the worrying regression of press freedom in Myanmar over recent years".
Laetitia van den Assum, a member of the former Rakhine Advisory Commission chaired by Kofi Annan, told The Myanmar Times that the court's decision is "Myanmar's loss".