MOGADISHU, Jan 16 (Xinhua) -- Unidentified assailants overnight attacked three independent radio stations in the central Somalia town of Galkayo, injuring three people and causing damage to station buildings, a radio executive said Saturday.

Galkayo, provincial capital of Mudug region, was a relatively peaceful town but has lately been the target of bombings, allegedly by Islamist rebels.

Three people including two local journalists were injured while two of the stations suffered damage to their buildings after the attackers, who wore masks, threw explosive devices into the Radio Galkayo, Radio Voice of Mudug and Radio Hobyo within minutes.

"We do not know why we were targeted because we have always strove to be impartial and balanced in our reporting of events in the region and the country as a whole," Abdulahi Hersi, Director of Radio Galkayo, told Xinhua.

Hersi said that the attack, which has not been claimed by any group so far, seemed well coordinated and was meant to cause "maximum damage possible" to the stations' staff.

Authorities in Galkayo which is divided between the Puntland state in the north of the town and Galmudug autonomous region in the south, stated that an investigations into the incident were underway.

A recent series of attacks blamed on Islamist forces have taken place in both sides of the town of Galkayo which has been divided along clan lines for the past two decades.