Mr. Yasin Jama Ali, a reporter for the independent Radio Horyaal, was arrested by Somaliland police last Wednesday in the Gulf of Aden port city of Berbera.
He has not been brought to court and formally charged with a crime, but Somaliland authorities consider Radio Horyaal to be an illegal radio station since local laws prohibit independently owned radio stations in Somaliland.
Recently, Radio Horyaal's director and another reporter were arrested in the Somaliland capital Hargeisa but later released.
Somaliland is preparing for presidential elections on September 27, which incumbent President Dahir Riyale says will be held on time without the voter-registration data.
There are concerns that Somaliland's main opposition party, Kulmiye, might boycott the presidential election in a dispute with the election commission and the ruling UDUB party.
Located in northwestern Somalia, Somaliland unilaterally declared independence from the rest of the Horn of Africa country in 1991 but has not been recognized internationally.