Two Reuters journalists completed a week in detention in Myanmar on Tuesday, with no word on where they were being held as authorities proceeded with an investigation into whether they violated the country's colonial-era Official Secrets Act.

Journalists Wa Lone, 31, and Kyaw Soe Oo, 27, were arrested on the evening of Dec. 12 after they were invited to dine with police officers on the outskirts of Myanmar's largest city, Yangon.

"We and their families continue to be denied access to them or to the most basic information about their well-being and whereabouts," Reuters President and Editor-In-Chief Stephen J. Adler said in a statement calling for their immediate release.