Police in Myanmar examined the mobile phones of two Reuters reporters accused of possessing secret documents without a search warrant after their arrests in December, an officer told a court on Monday, in what has become a landmark press freedom case.

Prosecution witness Maj. Aung Kyaw San said police did not have a warrant to search the phones because the reporters were accused under the Official Secrets Act, which gave officers the power to make arrests and begin an investigation without needing prior permission from a court.

That assertion was disputed by defense lawyer Khin Maung Zaw, who told Reuters after the hearing that only the arrests were allowed before seeking the approval of a judge. "This is not acceptable," he said. "Regarding (obtaining) evidence, a warrant is needed."