It said the military tribunal had announced "a complete stop to the prosecution".

"The government commissioner simply reflected an instruction from the head of state, [President] Paul Biya,” the report said. Ms Mefo is the star presenter and head of English news at the Douala-based media outlet that widely reports on the conflict in Cameroon’s two English-speaking regions, South-West and North-West.

She was detained on 7 November after reporting on the killing of US missionary Charles Wesco on the outskirts of the north-western city of Bamenda. Mr Wesco’s family blamed the Cameroonian army for his murder.

Ms Mefo was released on Saturday after three days at New Bell Central Prison in Douala following pressure from local and international human rights groups. She thanked supporters for standing by her:

Mimi237@Mimimefo237

 Your mobilisation, love and support made me stronger. I will forever remain grateful. I just did my job and thanks for believing in me.

To speak for the voiceless will forever remain my passion. We are a family and family is everything!

Thank You!????????????????https://m.facebook.com/story.php?story_fbid=2112483768796189&id=1927380740639827 …