A top Tanzanian comedian is being held for sharing face-swap photos of President John Magufuli, reports indicate.
Mr Idris Sultan, a popular comedian in East Africa, was first told to report to the nearest police station before he was arrested on Thursday in Dar es Salaam.
His lawyer said he was being held under the controversial Cybercrimes Act, which forbids using a computer system to "impersonate" someone else.
Sultan, the one-time winner of Big Brother Africa, shared two photos on his social media accounts which have more than five million followers.
One of the pictures shows Sultan posing on a presidential chair with the national seal, while the other shows Mr Magufuli's face on the comedian's body.
The caption was in Swahili, and read: "We swapped roles for a day so that he could enjoy his birthday in peace."
Shortly after the photos were posted, an Instagram comment, thought to be from Paul Makonda, the Regional Commissioner for Dar es Salaam, told Sultan to report to any police station in the city for further instructions, adding that he "doesn't know the boundaries of his work."
His reports comes amid national outcry over President Magufuli's administration style, with a number of citizens accusing him of dictatorship.
Amnesty International early this week claimed that democracy is losing meaning in Tanzania, accusing Magufuli of violating human rights.
The Tanzanian president has often been accused of breaching media freedoms by ordering for arrest and detentions of journalists and critics.
Magufuli's office is yet to issue a statement with regard to the arrest and incarceration of Mr Idris Sultan, a celebrity by his own right in Tanzania.