That's a week of being held in solitary confinement in a cold cell, according to his family without charge and without being shown any evidence of wrongdoing.

According to his lawyer, Camaro was arrested at his home in the capital, Addis Ababa, last Thursday Christmas Eve, and is being held until at least January, the eighth pending a police investigation.

Cameras lawyer Melkamu ago said police had told him their lines of enquiry included accusations of disseminating false information, communicating with groups fighting the government on disturbing the public's peace and security.

But he said he has seen no evidence.

Ethiopian police and prosecutor's office did not respond to requests for comment.

On Monday, Reuters editor in Chief Stephen Jay Adler described cameras work as a demonstration of his professionalism and impartiality and said the company is not aware of any basis for his detention.

Since taking office in 2018, Ethiopian Prime Minister Abdullah Ahmad has been lauded for sweeping reforms, including the release of political prisoners and the UN banning of media outlets.

But after a year that saw outbreaks of deadly violence, including a conflict in the northern Tigre region.

Rights activists fear his government is resorting to the authoritarians ways of the past.

Thousands have been arrested, including, according to international media watchdogs, seven Ethiopian journalists in November when the conflict broke out in Tigre.

Abby's office did not return calls seeking comment.

His government has previously said the nation is facing security threats and is committed to maintaining law and order.