He was re-arrested following an arrest warrant issued by the Somali police commissioner, privately-owned Radio Risala website reported.

Mr Mumin was first arrested last week after he criticised a government directive banning local media outlets from reporting on activities of the militant group al-Shabab.

The information ministry had then said that Mr Mumin was being "held on security-related charges" without giving further details.

He was freed by a regional court a day ago.

The journalists rights' watchdog, the Committee to Protect Journalists, has called on the Somali authorities to immediately release Mr Mumin "and bring an end to this victimisation".